Oklahoma
Oklahoma ( (listen); Choctaw: Oklahumma, pronounced [oklahómma]; Cherokee: ᎣᎧᎳᎰᎹ, Okalahoma, pronounced [ògàlàhǒːmã́]) is a state in the South Central region of the United States, bordered by the state of Texas to the south and west, Kansas to the north, Missouri to the northeast, Arkansas to the east, New Mexico to the west, and Colorado to the northwest. Partially in the western extreme of the Upland South, it is the 20th-most extensive and the 28th-most populous of the 50 United States. Its residents are known as Oklahomans and its capital and largest city is Oklahoma City.
The state's name is derived from the Choctaw words okla, 'people' and humma, which translates as 'red'. Oklahoma is also known informally by its nickname, "The Sooner State", in reference to the Sooners, settlers who staked their claims in the Unassigned Lands before the Indian Appropriations Act of 1889 authorized the Land Rush of 1889. 
The land now known as Oklahoma has been inhabited since at least the last ice age. The Southern Plains villagers and the Mississippian people inhabited the area between roughly 800 and 1500. The Southern Plains Panhandle culture developed in the Oklahoma Panhandle in western Oklahoma while the Caddoan Mississippian culture inhabited the eastern parts of the state and included the major settlement of Spiro Mounds. The area was also inhabited by the Wichita people, Tonkawa people, and Caddo people. Between 1300 and 1500, the Plains Apache migrated into the Southern Great Plains (now western Oklahoma). During the 1700s, the Comanche people, Kiowa people, Osage people, and Quapaw people migrated into the region. 
The first European contact with the region was the Spanish explorer Francisco Vázquez de Coronado in 1541. However, the land was claimed by the Kingdom of France's Louisiana colony and included in the Louisiana Purchase to the United States in 1803. Oklahoma was part of District of Louisiana (1804-1805), Louisiana Territory (1805-1812), Missouri Territory (1812-1821), Arkansas Territory (1819-1828), before finally being designated Indian Territory. In the 1830s, the United States began forcibly removing Native Americans to Indian Territory, with the most famous instance being the deportation of the Five Civilized Tribes (Cherokee, Chickasaw, Choctaw, Muscogee, and the Seminole) which became known as the Trail of Tears. During the American Civil War, the Five Tribes formally sided with the Confederate States of America, while some tribal members served in the Union-aligned Indian Home Guard. After the American Civil War, slavery was abolished by treaty in the Five Tribes. Between 1866 and 1899, the cattle trails from Texas to Kansas ran through the territory. The Dawes Act of 1887 began the allotment of most Oklahoma tribes and the Curtis Act of 1898 authorized the allotment of the Five Tribes territory. The Indian Appropriations Act of 1889 authorized the Land Rush of 1889 in the Unassigned Lands of Indian Territory. In 1890,  
Oklahoma Territory was formed out of the western half of Indian Territory. After an attempt to make Indian Territory into the State of Sequoyah failed in 1905, Oklahoma Territory and Indian Territory were merged into the State of Oklahoma when it became the 46th state to enter the union on November 16, 1907.
The 20th century discovery of petroleum led to the development of a powerful oil industry. In the 1910s and 1920s, Oklahoma experience major instances of civil unrest with the Green Corn Rebellion and the Tulsa Race Massacre. In the 1930s, the Dust Bowl led to mass emigration from the state. Conservation efforts in the state reversed population declines in 1950 and continued through the 1960s. In 1995, the state was the site of one of the largest domestic terror attacks, the Oklahoma City Bombing. In the 21st century, the United States Supreme Court ruled in McGirt v. Oklahoma that the Muscogee Nation reservation was never disestablished. The ruling led to similar rulings regarding the other Five Tribes (Cherokee Nation, Choctaw Nation, Chickasaw Nation and Seminole Nation of Oklahoma).
With ancient mountain ranges, prairie, mesas, and eastern forests, most of Oklahoma lies in the Great Plains, Cross Timbers, and the U.S. Interior Highlands, all regions prone to severe weather. Oklahoma is at a confluence of three major American cultural regions. Historically, it served as a government-sanctioned territory for Native Americans removed from east of the Mississippi River, a route for cattle drives from Texas and related regions, and a destination for Southern settlers. There are currently 25 Native American languages spoken in Oklahoma.A major producer of natural gas, oil, and agricultural products, Oklahoma relies on an economic base of aviation, energy, telecommunications, and biotechnology. Oklahoma City and Tulsa serve as Oklahoma's primary economic anchors, with nearly two-thirds of Oklahomans living within their metropolitan statistical areas.

Etymology
The name Oklahoma comes from the Choctaw language phrase okla, 'people', and humma, translated as 'red'. Choctaw Nation Chief Allen Wright suggested the name in 1866 during treaty negotiations with the federal government on the use of Indian Territory. He envisioned an all–American Indian state controlled by the United States Superintendent of Indian Affairs. Oklahoma later became the de facto name for Oklahoma Territory, and it was officially approved in 1890, two years after that area was opened to white settlers.In the Chickasaw language, the state is known as Oklahomma', in Arapaho as bo'oobe' (lit. 'red earth'), Pawnee: Uukuhuúwa, and Cayuga: Gahnawiyoˀgeh.

History
Settlements
Indigenous peoples were present in what is now Oklahoma by the last ice age. Ancestors of the Wichita and Affiliated Tribes (including Teyas and Escanjaques and Tawakoni), Tonkawa, and Caddo (including Kichai) lived in what is now Oklahoma. Southern Plains villagers lived in the central and west of the state, with a subgroup, the Panhandle culture people, living in the panhandle region. Caddoan Mississippian culture peoples lived in the eastern part of the state. Spiro Mounds, in what is now Spiro, Oklahoma, was a major Mississippian mound complex that flourished between AD 850 and 1450. Plains Apache people settled in the Southern Plains and in Oklahoma between 1300 and 1500.The Expedition of Spaniard Francisco Vázquez de Coronado traveled through the state in 1541, but French explorers claimed the area in the early 18th century. By the 18th century, Comanche and Kiowa entered the region from the west and Quapaw and Osage peoples moved into what is now eastern Oklahoma. French colonists claimed the region until 1803, when all the French territory west of the Mississippi River was acquired by the United States in the Louisiana Purchase. The territory was a part of the Arkansas Territory from 1819 until 1828.During the 19th century, the U.S. federal government forcibly removed tens of thousands of Native Americans from their homelands from across North America and transported them to the area including and surrounding present-day Oklahoma. The Choctaw was the first of the Five Civilized Tribes to be removed from the Southeastern United States. The phrase "Trail of Tears" originated from a description of the removal of the Choctaw Nation in 1831, although the term is usually used for the Cherokee removal.Seventeen thousand Cherokees and 2,000 of their black slaves were deported. The area, already occupied by Osage and Quapaw tribes, was called for the Choctaw Nation until revised Native American and then later American policy redefined the boundaries to include other Native Americans. By 1890, more than 30 Native American nations and tribes had been concentrated on land within Indian Territory or "Indian Country".All Five Civilized Tribes supported and signed treaties with the Confederate military during the American Civil War. The Cherokee Nation had an internal civil war. Slavery in Indian Territory was not abolished until 1866.In the period between 1866 and 1899, cattle ranches in Texas strove to meet the demands for food in eastern cities and railroads in Kansas promised to deliver in a timely manner. Cattle trails and cattle ranches developed as cowboys either drove their product north or settled illegally in Indian Territory. In 1881, four of five major cattle trails on the western frontier traveled through Indian Territory.Increased presence of white settlers in Indian Territory prompted the United States Government to establish the Dawes Act in 1887, which divided the lands of individual tribes into allotments for individual families, encouraging farming and private land ownership among Native Americans but expropriating land to the federal government. In the process, railroad companies took nearly half of Indian-held land within the territory for outside settlers and for purchase.Major land runs, including the Land Run of 1889, were held for settlers where certain territories were opened to settlement starting at a precise time. Usually land was open to settlers on a first come first served basis. Those who broke the rules by crossing the border into the territory before the official opening time were said to have been crossing the border sooner, leading to the term sooners, which eventually became the state's official nickname. Deliberations to make the territory into a state began near the end of the 19th century, when the Curtis Act continued the allotment of Indian tribal land.

20th and 21st centuries
Attempts to create an all-Indian state named Oklahoma and a later attempt to create an all-Indian state named Sequoyah failed but the Sequoyah Statehood Convention of 1905 eventually laid the groundwork for the Oklahoma Statehood Convention, which took place two years later. On June 16, 1906, Congress enacted a statute authorizing the people of the Oklahoma and Indian Territories (as well what would become the states of Arizona and New Mexico) to form a constitution and state government in order to be admitted as a state. On November 16, 1907, President Theodore Roosevelt issued Presidential Proclamation no. 780, establishing Oklahoma as the 46th state in the Union.The new state became a focal point for the emerging oil industry, as discoveries of oil pools prompted towns to grow rapidly in population and wealth. Tulsa eventually became known as the "Oil Capital of the World" for most of the 20th century and oil investments fueled much of the state's early economy. In 1927, Oklahoman businessman Cyrus Avery, known as the "Father of Route 66", began the campaign to create U.S. Route 66. Using a stretch of highway from Amarillo, Texas to Tulsa, Oklahoma to form the original portion of Highway 66, Avery spearheaded the creation of the U.S. Highway 66 Association to oversee the planning of Route 66, based in his hometown of Tulsa.In late September of 1918, the first cases of the Spanish flu  appeared in Oklahoma. Though public health authorities statewide had some indication that the pandemic was  westward, the turmoil caused by the rapid advancement of the disease quickly overwhelmed both health workers and local governing bodies. In Oklahoma City, shortages of both supplies and personnel were mitigated, in part, by the mobilization of the American Red Cross. Rough estimates based on contemporary reports indicate that approximately 100,000 people fell ill with the disease before the pandemic ebbed in 1919. Of those 100,000 cases, it is assumed that around 7,500 proved fatal, placing total mortality rates for the state in the area of 7.5%.Oklahoma also has a rich African-American history. Many Black towns, founded by the Freedmen of the Five Tribes during Reconstruction, thrived in the early 20th century with the arrival of Black Exodusters who migrated from neighboring states, especially Kansas. The politician Edward P. McCabe encouraged Black settlers to come to what was then Indian Territory. McCabe discussed with President Theodore Roosevelt the possibility of making Oklahoma a majority-Black state.By the early 20th century, the Greenwood district of Tulsa was one of the most prosperous African-American communities in the United States. Jim Crow laws had established racial segregation since before the start of the 20th century, but Tulsa's Black residents had created a thriving area.Social tensions were exacerbated by the revival of the Ku Klux Klan after 1915. The Tulsa race massacre broke out in 1921, with White mobs attacking Black people and carrying out a pogrom in Greenwood. In one of the costliest episodes of racist violence in American history, sixteen hours of rioting resulted in the destruction of 35 city blocks, $1.8 million in property damage, and an estimated death toll of between 75 and 300 people. By the late 1920s, the Ku Klux Klan had declined to negligible influence within the state.
During the 1930s, parts of the state began to suffer from the consequences of poor farming practices. This period was known as the Dust Bowl, throughout which areas of Kansas, Texas, New Mexico and northwestern Oklahoma were hampered by long periods of little rainfall, strong winds, abnormally high temperatures, and most notably, severe dust storms sending thousands of farmers into poverty and forcing them to relocate to more fertile areas of the western United States. Over a twenty-year period ending in 1950, the state saw its only historical decline in population, dropping 6.9 percent as impoverished families migrated out of the state after the Dust Bowl.
Soil and water conservation projects markedly changed practices in the state and led to the construction of massive flood control systems and dams; they built hundreds of reservoirs and man-made lakes to supply water for domestic needs and agricultural irrigation. By the 1960s, Oklahoma had created more than 200 lakes, the most in the nation.
In 1995, Oklahoma City was the site of the most destructive act of domestic terrorism in American history. The Oklahoma City bombing of April 19, 1995, in which Timothy McVeigh detonated a large, crude explosive device outside the Alfred P. Murrah Federal Building, killed 168 people, including 19 children. For his crime, McVeigh was executed by the federal government on June 11, 2001. His accomplice, Terry Nichols, is serving life in prison without parole for helping plan the attack and prepare the explosive.On May 31, 2016, several cities experienced record setting flooding.
On July 9, 2020, the Supreme Court of the United States determined in McGirt v. Oklahoma that the reservations of the Five Tribes, comprising much of Eastern Oklahoma, were never disestablished by Congress and thus are still "Indian Country" for the purposes of criminal law.Later decisions by the Oklahoma Court of Criminal Appeals also found the Quapaw Nation, Ottawa Tribe, Peoria Tribe, and Miami Tribe  also had existing reservations. The Osage Nation is still awaiting an appellate decision after a district judge ruled that the Osage reservation was disestablished.

Geography
Oklahoma is the 20th-largest state in the United States, covering an area of 69,899 square miles (181,040 km2), with 68,595 square miles (177,660 km2) of land and 1,304 square miles (3,380 km2) of water. It lies partly in the Great Plains near the geographical center of the 48 contiguous states. It is bordered on the east by Arkansas and Missouri, on the north by Kansas, on the northwest by Colorado, on the far west by New Mexico, and on the south and near-west by Texas.

Borders
Oklahoma's border with Kansas was defined as the 37th Parallel in the 1854 Kansas-Nebraska Act. This was disputed with the Cherokee and Osage Nations which claimed their border extended North of this line and could not be part of the Kansas Territory. This was resolved in 1870 with the Drum Creek Treaty, which reestablished Kansas's southern border as the 37th parallel. This also applied to the then No-Man's Land that became the Oklahoma Panhandle.
The Oklahoma-Texas border consists of the Red River in the south and the 100th meridian west as the western border between Oklahoma and the Texas Panhandle. These were first established in the 1819 Adams–Onís Treaty between the United States and Spain.
The Oklahoma panhandle was originally part of the Panhandle of the Republic of Texas, but when Texas joined the Union as a slave state, it could not retain any lands north of 36 degrees 30 minutes, as specified in the Missouri Compromise. The Panhandle existed as a no-man's land until 1907 when Oklahoma acquired the territory upon gaining statehood.
Oklahoma's Eastern border is divided between Missouri and Arkansas. The Missouri-Oklahoma border is defined as the Meridian passing through the Kawsmouth, where the Kansas River meets the Missouri River. This is the same Meridian as the Kansas-Missouri border.
The Oklahoma-Arkansas border was originally defined by two lines: the borders between Arkansas and the Cherokee and Choctaw Reservations. This formed two diagonal lines meeting at the western edge of Fort Smith Arkansas, with one line running northeast from the Red River and the other running southeast from the Oklahoma-Arkansas-Missouri border. The Choctaw-Arkansas border was established in the 1820 Treaty of Doak's Sand, and later refined in the 1830 Treaty of Dancing Rabbit Creek. These treaties left a 57-acre exclave of the Choctaw reservation bounded by Arkansas, the Arkansas River and the Poteau River. This became the site of a smuggling camp called "Coke Hill", noted mostly for its importance in cocaine smuggling.After Petitioning congress to hand over jurisdiction, the 57 acres was given to Arkansas in 1905. The 1985 US Supreme Court Case Oklahoma v. Arkansas decided the land would remain Arkansas, even though the Choctaw had not been notified or asked about the territory being handed over. Therefore, the Poteau River serves as the Oklahoma-Arkansas boundary for approximately 1 mile, reducing the Choctaw Reservation and later Oklahoma by 57 acres as established in the treaties of the early 1800s.

Topography
Oklahoma is between the Great Plains and the Ozark Plateau in the Gulf of Mexico watershed, generally sloping from the high plains of its western boundary to the low wetlands of its southeastern boundary. Its highest and lowest points follow this trend, with its highest peak, Black Mesa, at 4,973 feet (1,516 m) above sea level, situated near its far northwest corner in the Oklahoma Panhandle. The state's lowest point is on the Little River near its far southeastern boundary near the town of Idabel, which dips to 289 feet (88 m) above sea level.Among the most geographically diverse states, Oklahoma is one of four to harbor more than 10 distinct ecological regions, with 11 in its borders—more per square mile than in any other state. Its western and eastern halves, however, are marked by extreme differences in geographical diversity: Eastern Oklahoma touches eight ecological regions and its western half contains three. Although having fewer ecological regions Western Oklahoma contains many rare, relic species.Oklahoma has four primary mountain ranges: the Ouachita Mountains, the Arbuckle Mountains, the Wichita Mountains, and the Ozark Mountains. Contained within the U.S. Interior Highlands region, the Ozark and Ouachita Mountains are the only major mountainous region between the Rocky Mountains and the Appalachians. A portion of the Flint Hills stretches into north-central Oklahoma, and near the state's eastern border, The Oklahoma Tourism & Recreation Department regards Cavanal Hill as the world's tallest hill; at 1,999 feet (609 m), it fails their definition of a mountain by one foot.The semi-arid high plains in the state's northwestern corner harbor few natural forests; the region has a rolling to flat landscape with intermittent canyons and mesa ranges like the Glass Mountains. Partial plains interrupted by small, sky island mountain ranges like the Antelope Hills and the Wichita Mountains dot southwestern Oklahoma; transitional prairie and oak savannas cover the central portion of the state. The Ozark and Ouachita Mountains rise from west to east over the state's eastern third, gradually increasing in elevation in an eastward direction.More than 500 named creeks and rivers make up Oklahoma's waterways, and with 200 lakes created by dams, it holds the nation's highest number of artificial reservoirs. Most of the state lies in two primary drainage basins belonging to the Red and Arkansas Rivers, though the Lee and Little Rivers also contain significant drainage basins.

Flora and fauna
Due to Oklahoma's location at the confluence of many geographic regions, the state's climatic regions have a high rate of biodiversity. Forests cover 24 percent of Oklahoma and prairie grasslands composed of shortgrass, mixed-grass, and tallgrass prairie, harbor expansive ecosystems in the state's central and western portions, although cropland has largely replaced native grasses. Where rainfall is sparse in the state's western regions, shortgrass prairie and shrublands are the most prominent ecosystems, though pinyon pines, red cedar (junipers), and ponderosa pines grow near rivers and creek beds in the panhandle's far western reaches. Southwestern Oklahoma contains many rare, disjunct species, including sugar maple, bigtooth maple, nolina, and Texas live oak.Marshlands, cypress forests, and mixtures of shortleaf pine, loblolly pine, blue palmetto, and deciduous forests dominate the state's southeastern quarter, while mixtures of largely post oak, elm, red cedar (Juniperus virginiana), and pine forests cover northeastern Oklahoma.The state holds populations of white-tailed deer, mule deer, antelope, coyotes, mountain lions, bobcats, elk, and birds such as quail, doves, cardinals, bald eagles, red-tailed hawks, and pheasants. In prairie ecosystems, American bison, greater prairie chickens, badgers, and armadillo are common, and some of the nation's largest prairie dog towns inhabit shortgrass prairie in the state's panhandle. The Cross Timbers, a region transitioning from prairie to woodlands in Central Oklahoma, harbors 351 vertebrate species. The Ouachita Mountains are home to black bear, red fox, gray fox, and river otter populations, which coexist with 328 vertebrate species in southeastern Oklahoma. Also in southeastern Oklahoma lives the American alligator.

Protected lands
Oklahoma has fifty-one state parks, six national parks or protected regions, two national protected forests or grasslands, and a network of wildlife preserves and conservation areas. Six percent of the state's 10 million acres (40,000 km2) of forest is public land, including the western portions of the Ouachita National Forest, the largest and oldest national forest in the Southern United States.With 39,000 acres (160 km2), the Tallgrass Prairie Preserve in north-central Oklahoma is the largest protected area of tallgrass prairie in the world and is part of an ecosystem that encompasses only ten percent of its former land area, once covering fourteen states. In addition, the Black Kettle National Grassland covers 31,300 acres (127 km2) of prairie in southwestern Oklahoma. The Wichita Mountains Wildlife Refuge is the oldest and largest of nine National Wildlife Refuges in the state and was founded in 1901, encompassing 59,020 acres (238.8 km2).Of Oklahoma's federally protected parks or recreational sites, the Chickasaw National Recreation Area is the largest, with 9,898.63 acres (40.0583 km2). Other sites include the Santa Fe and Trail of Tears national historic trails, the Fort Smith and Washita Battlefield national historic sites, and the Oklahoma City National Memorial.

Climate
Oklahoma is in a humid subtropical region that lies in a transition zone between semiarid further to the west, humid continental to the north, and humid subtropical to the east and southeast. Most of the state lies in an area known as Tornado Alley characterized by frequent interaction between cold, dry air from Canada, warm to hot, dry air from Mexico and the Southwestern U.S., and warm, moist air from the Gulf of Mexico. The interactions between these three contrasting air currents produces severe weather (severe thunderstorms, damaging thunderstorm winds, large hail and tornadoes) with a frequency virtually unseen anywhere else on planet Earth. An average 62 tornadoes strike the state per year—one of the highest rates in the world.Because of Oklahoma's position between zones of differing prevailing temperature and winds, weather patterns within the state can vary widely over relatively short distances, and they can change drastically in a short time. On November 11, 1911, the temperature at Oklahoma City reached 83 °F (28 °C) (the record high for that date), then a cold front of unprecedented intensity slammed across the state, causing the temperature to reach 17 °F (−8 °C) (the record low for that date) by midnight. This type of phenomenon is also responsible for many of the tornadoes in the area, such as the 1912 Oklahoma tornado outbreak when a warm front traveled along a stalled cold front, resulting in an average of about one tornado per hour.The humid subtropical climate (Köppen Cfa) of central, southern, and eastern Oklahoma is influenced heavily by southerly winds bringing moisture from the Gulf of Mexico. Traveling westward, the climate transitions progressively toward a semiarid zone (Köppen BSk) in the high plains of the Panhandle and other western areas from about Lawton westward, less frequently touched by southern moisture. Precipitation and temperatures decline from east to west accordingly, with areas in the southeast averaging an annual temperature of 62 °F (17 °C) and an annual rainfall of generally over 40 in (1,020 mm) and up to 56 in (1,420 mm), while areas of the (higher-elevation) panhandle average 58 °F (14 °C), with annual rainfall under 17 in (430 mm).Over almost all of Oklahoma, winter is the driest season. Average monthly precipitation increases dramatically in the spring to a peak in May, the wettest month over most of the state, with its frequent and not uncommonly severe thunderstorm activity. Early June can still be wet, but most years see a marked decrease in rainfall during June and early July. Mid-summer (July and August) represents a secondary dry season over much of Oklahoma, with long stretches of hot weather with only sporadic thunderstorm activity not uncommon many years. Severe drought is common in the hottest summers, such as those of 1934, 1954, 1980 and 2011, all of which featured weeks on end of virtual rainlessness and highs well over 100 °F (38 °C). Average precipitation rises again from September to mid-October, representing a secondary wetter season, then declines from late October through December.The entire state frequently experiences temperatures above 100 °F (38 °C) or below 0 °F (−18 °C), though below-zero temperatures are rare in south-central and southeastern Oklahoma. Snowfall ranges from an average of less than 4 in (102 mm) in the south to just over 20 in (508 mm) on the border of Colorado in the panhandle. The state is home to the Storm Prediction Center, the National Severe Storms Laboratory, and the Warning Decision Training Division, all part of the National Weather Service and in Norman.

Cities and towns
Oklahoma had 598 incorporated places in 2010, including four cities over 100,000 in population and 43 over 10,000. Two of the fifty largest cities in the United States are in Oklahoma, Oklahoma City and Tulsa, and sixty-five percent of Oklahomans live within their metropolitan areas, or spheres of economic and social influence defined by the United States Census Bureau as a metropolitan statistical area. Oklahoma City, the state's capital and largest city, had the largest metropolitan area in the state in 2020, with 1,425,695 people, and the metropolitan area of Tulsa had 1,015,331 residents. Between 2000 and 2010, the leading cities in population growth were Blanchard (172.4%), Elgin (78.2%), Jenks (77.0%), Piedmont (56.7%), Bixby (56.6%), and Owasso (56.3%).In descending order of population, Oklahoma's largest cities in 2010 were: Oklahoma City (579,999, +14.6%), Tulsa (391,906, −0.3%), Norman (110,925, +15.9%), Broken Arrow (98,850, +32.0%), Lawton (96,867, +4.4%), Edmond (81,405, +19.2%), Moore (55,081, +33.9%), Midwest City (54,371, +0.5%), Enid (49,379, +5.0%), and Stillwater (45,688, +17.0%). Of the state's ten largest cities, three are outside the metropolitan areas of Oklahoma City and Tulsa, and only Lawton has a metropolitan statistical area of its own as designated by the United States Census Bureau, though the metropolitan statistical area of Fort Smith, Arkansas extends into the state.Under Oklahoma law, municipalities are divided into two categories: cities, defined as having more than 1,000 residents, and towns, with under 1,000 residents. Both have legislative, judicial, and public power within their boundaries, but cities can choose between a mayor–council, council–manager, or strong mayor form of government, while towns operate through an elected officer system.

Demographics
From a 1920 U.S. census population of 2,028,283, Oklahoma's population has continued to increase. At the 2010 census, its population was 3,751,675. The 2020 Census revealed its population to be was 3,959,353, an 5.5% increase since 2010. A 2022 American Community Survey estimate found that the population had surpassed 4 million residents for the first time. Among the states of the South Central region, Oklahoma had the second-largest population increase from 2010 to 2020, behind Texas.Of the state's total resident population, approximately 236,882 were immigrants according to a study in 2018, making up 6% of the state's population at the time. Most of its immigrant population came from Mexico (45%), Vietnam (5%), India (5%), Germany (3%), and Guatemala (3%). In the state, 246,550 residents were native-born Americans who had at least one immigrant parent. An estimated 85,000 immigrants were undocumented with 125,989 Oklahomans having lived with at least one undocumented family member between 2010 and 2014. Immigrants to Oklahoma have contributed more than a billion U.S. dollars in taxes in 2018. In 2011, the U.S. Census Bureau's American Community Survey data from 2005 to 2009 indicated about 5% of Oklahoma's residents were born outside the United States. This was lower than the national figure (about 12.5% of U.S. residents were foreign-born).In 2010, the center of population of Oklahoma was in Lincoln County near the town of Sparks.According to HUD's 2022 Annual Homeless Assessment Report, there were an estimated 3,754 homeless people in Oklahoma.

Race and ethnicity
As with majority of the U.S., Oklahoma has experienced diversification since the beginning of the 21st century; in 1940, 90.1% of the state's population was non-Hispanic white; in 2020, 75.5% of the population was white, down from 1990's 81% yet up from 2010's 72.2%. Among its population at the 2020 census, the remainder of its increasingly diverse population was 11.9% Hispanic or Latino of any race, 16% American Indian and Alaska Native, 9.7% Black or African American, 3.1% Asian, 0.4% Native Hawaiian and other Pacific Islander, and 9% some other race. According to the 2010 census, 8.6% were American Indian and Alaska Native, 7.4% Black or African American, 1.7%  Asian, 0.1% Native Hawaiian and other Pacific Islander, 4.1% from some other race and 5.9% of two or more races; 8.9% of Oklahoma's population were of Hispanic, Latino, or Spanish origin (they may be of any race).
In 2005, Oklahoma's estimated ancestral makeup was 14.5% German, 13.1% American, 11.8% Irish, 9.6% English, 8.1% African American, and 11.4% Native American (including 7.9% Cherokee), though the percentage of people claiming American Indian as their only race was 8.1%. Most people from Oklahoma who self-identify as having American ancestry are of overwhelmingly English and Scots-Irish ancestry with significant amounts of Scottish, Welsh and Irish inflection as well.In 2011, 47.3% of Oklahoma's population younger than age 1 were minorities, meaning they had at least one parent who was not non-Hispanic white.

Language
English
The English language has been official in the state of Oklahoma since 2010. The variety of North American English spoken is called Oklahoma English, and this dialect is quite diverse with its uneven blending of features of North Midland, South Midland, and Southern dialects. In 2000, 2,977,187 Oklahomans—92.6% of the resident population, five years or older—spoke only English at home, a decrease from 95% in 1990. 238,732 Oklahoma residents reported speaking a language other than English at home in the 2000 census, about 7.4% of the state's population.

Native American languages
The two most commonly spoken native North American languages are Cherokee and Choctaw, with 10,000 Cherokee speakers living within the Cherokee Nation tribal jurisdiction area of eastern Oklahoma and another 10,000 Choctaw speakers living in the Choctaw Nation directly south of the Cherokees. Cherokee is an official language in the Cherokee Nation tribal jurisdiction area and in the United Keetoowah Band of Cherokee Indians.Twenty-five Native American languages are spoken in Oklahoma, second only to California. However, only Cherokee, if any, exhibits some language vitality at present. Ethnologue sees Cherokee as moribund because the only remaining active users of the language are members of the grandparent generation and older.

Other languages
Spanish is the second-most commonly spoken language in the state, with 141,060 speakers counted in 2000. German has 13,444 speakers representing about 0.4% of the state's population, and Vietnamese is spoken by 11,330 people, or about 0.4% of the population, many of whom live in the Asia District of Oklahoma City. Other languages include French with 8,258 speakers (0.3%), Chinese with 6,413 (0.2%), Korean with 3,948 (0.1%), Arabic with 3,265 (0.1%), other Asian languages with 3,134 (0.1%), Tagalog with 2,888 (0.1%), Japanese with 2,546 (0.1%), and African languages with 2,546 (0.1%).

Religion
Oklahoma is part of a geographical region characterized by conservative and Evangelical Protestant Christianity known as the "Bible Belt". Spanning the southern and eastern parts of the United States, the area is known for politically and socially conservative views, with the Republican Party having the greater number of voters registered between the two parties. Tulsa, the state's second-largest city, home to Oral Roberts University, is sometimes called the "buckle of the Bible Belt".In 2000, there were about 5,000 Jews and 6,000 Muslims, with ten congregations to each group.According to the Pew Research Center in 2008, the majority of Oklahoma's religious adherents were Christian, accounting for about 80% of the population. The percentage of Catholics was half the national average, while the percentage of Evangelical Protestants was more than twice the national average (tied with Arkansas for the largest percentage of any state).
In 2010, the state's largest church memberships were in the Southern Baptist Convention (886,394 members), the United Methodist Church (282,347), the Roman Catholic Church (178,430), and the Assemblies of God (85,926) and Church of Jesus Christ of Latter-day Saints (Mormons) (47,349). Other religions represented in the state include Buddhism, Hinduism, and Islam.According to the Pew Research Center in 2014, the majority of Oklahoma's religious adherents remained Christian accounting for 79% of the population, 9 percent higher than the national average. The percentage of Evangelical Protestants declined since the last study, but they remain the largest religious group in the state at 47% over 20 percent higher than the national average. The largest growth over the six years between Pew's 2008 and 2014 survey was in the number of people who identify as unaffiliated in the state with an increase of 6% of the total population.
By the 2020 Public Religion Research Institute's survey, 73% of the population were Christian. Evangelicalism made up 29% of the state population, followed by Mainline Protestantism at 19%. Historically and predominantly African-American and Latino churches collectively made up 8% of the religious demographic. An estimated 13% of the state's religious population were Roman Catholic. About 22% of the population had no religious affiliation.

Incarceration
Oklahoma has been described as "the world's prison capital", with 1,079 of every 100,000 residents imprisoned in 2018, the highest incarceration rate of any state, and by comparison, higher than the incarceration rates of any country in the world.

Gender issues
In 2022, Oklahoma was rated the worst state for women in a WalletHub study. The Oklahoman did investigative reporting and highlighted the inequities of men and women in the state based on this report. The Sentencing Project has highlighted the harsh sentencing laws in Oklahoma, such as Failure to Protect laws, which tend to over punish women than it does men who in an April 2023 report. The Human Rights Campaign has also pointed out cases of the Oklahoma legislature's actions against the LGBTQ population and censuring of a nonbinary lawmaker.

Economy
Oklahoma is host to a diverse range of sectors including aviation, energy, transportation equipment, food processing, electronics, and telecommunications. Oklahoma is an important producer of natural gas, aircraft, and food. The state ranks third in the nation for production of natural gas, is the 27th-most agriculturally productive state, and also ranks 5th in production of wheat. Four Fortune 500 companies and six Fortune 1000 companies are headquartered in Oklahoma, and it has been rated one of the most business-friendly states in the nation, with the 7th-lowest tax burden in 2007.
Total employment (2018): 1,385,228
Number of employer establishments: 93,561In 2010, Oklahoma City-based Love's Travel Stops & Country Stores ranked 18th on the Forbes list of largest private companies, Tulsa-based QuikTrip ranked 37th, and Oklahoma City-based Hobby Lobby ranked 198th in 2010 report. Oklahoma's gross domestic product grew from $131.9 billion in 2006 to $147.5 billion in 2010, a jump of 10.6 percent. Oklahoma's gross domestic product per capita was $35,480 in 2010, which was ranked 40th among the states. The state's 2006 per capita personal income ranked 37th at $32,210, though it has the third-fastest-growing per capita income in the U.S. Additionally, Oklahoma ranks consistently among the lowest states in cost of living index.Though oil has historically dominated the state's economy, a collapse in the energy industry during the 1980s led to the loss of nearly 90,000 energy-related jobs between 1980 and 2000, severely damaging the local economy. Oil accounted for 35 billion dollars in Oklahoma's economy in 2007, and employment in the state's oil industry was outpaced by five other industries in 2007. As of September 2020, the state's unemployment rate was 5.3%.

Industry
In mid-2011, Oklahoma had a civilian labor force of 1.7 million and non-farm employment fluctuated around 1.5 million. The government sector provides the most jobs, with 339,300 in 2011, followed by the transportation and utilities sector, providing 279,500 jobs, and the sectors of education, business, and manufacturing, providing 207,800, 177,400, and 132,700 jobs, respectively. Among the state's largest industries, the aerospace sector generates $11 billion annually.Tulsa is home to the largest airline maintenance base in the world, which serves as the global maintenance and engineering headquarters for American Airlines. In total, aerospace accounts for more than 10 percent of Oklahoma's industrial output, and it is one of the top 10 states in aerospace engine manufacturing. Because of its position in the center of the United States, Oklahoma is also among the top states for logistic centers, and a major contributor to weather-related research.The state is the top manufacturer of tires in North America and contains one of the fastest-growing biotechnology industries in the nation. In 2005, international exports from Oklahoma's manufacturing industry totaled $4.3 billion, accounting for 3.6 percent of its economic impact. Tire manufacturing, meat processing, oil and gas equipment manufacturing, and air conditioner manufacturing are the state's largest manufacturing industries.

Energy
Oklahoma is the nation's third-largest producer of natural gas, and its fifth-largest producer of crude oil. The state also has the second-greatest number of active drilling rigs, and it is even ranked fifth in crude oil reserves. While the state was ranked eighth for installed wind energy capacity in 2011, it still was at the bottom of states in usage of renewable energy in 2009, with 94% of its electricity being generated by non-renewable sources in 2009, including 25% from coal and 46% from natural gas.Ten years later in 2019, 53.5% of electricity was produced from natural gas and 34.6% from wind power.Ranking 13th for total energy consumption per capita in 2009, the state's energy costs were eighth-lowest in the nation.

Oil, gas, and coal
As a whole, the oil energy industry contributes $35 billion to Oklahoma's gross domestic product (GDP), and employees of the state's oil-related companies earn an average of twice the state's typical yearly income. In 2009, the state had 83,700 commercial oil wells churning 65.374 million barrels (10,393,600 m3) of crude oil. A tabulated 8.5% of the nation's natural gas supply is held in Oklahoma, with 1.673 trillion cubic feet (47.4 km3) being produced in 2009.The Oklahoma Stack Play is a geographic referenced area in the Anadarko Basin. The oil field "Sooner Trend", Anadarko basin and the counties of Kingfisher and Canadian make up the basis for the "Oklahoma STACK". Other Plays such as the Eagle Ford are geological rather than geographical.According to Forbes magazine, Oklahoma City-based Devon Energy Corporation, Chesapeake Energy Corporation, and SandRidge Energy Corporation are the largest private oil-related companies in the nation, and all Oklahoma's Fortune 500 companies are energy-related. Tulsa's ONEOK and Williams Companies are the state's largest and second-largest companies respectively, also ranking as the nation's second- and third-largest companies in the field of energy, according to Fortune magazine. The magazine also placed Devon Energy as the second-largest company in the mining and crude oil-producing industry in the nation, while Chesapeake Energy ranks seventh respectively in that sector and Oklahoma Gas & Electric ranks as the 25th-largest gas and electric utility company.Oklahoma Gas & Electric, commonly referred to as OG&E (NYSE: OGE) operates four base electric power plants in Oklahoma. Two of them are coal-fired power plants: one in Muskogee, and the other in Red Rock. Two are gas-fired power plants: one in Harrah and the other in Konawa. OG&E was the first electric company in Oklahoma to generate electricity from wind farms in 2003.

Nuclear power
Oklahoma had no operational nuclear power plants as of March 2021.In 1973, the Public Service Company of Oklahoma proposed the Black Fox Nuclear Power Plant near Inola, Oklahoma. Protestors disrupted project construction in 1979, several months after the Three Mile Island accident, and the project was cancelled in 1982 after nine years of legal challenges.

Wind generation
Agriculture
The 27th-most agriculturally productive state, Oklahoma is fifth in cattle production and fifth in production of wheat. Approximately 5.5 percent of American beef comes from Oklahoma, while the state produces 6.1 percent of American wheat, 4.2 percent of American pig products, and 2.2 percent of dairy products.The state had 85,500 farms in 2012, collectively producing $4.3 billion in animal products and fewer than one billion dollars in crop output with more than $6.1 billion added to the state's gross domestic product. Poultry and swine are its second- and third-largest agricultural industries.

Education
With an educational system made up of public school districts and independent private institutions, Oklahoma had 638,817 students enrolled in 1,845 public primary, secondary, and vocational schools in 533 school districts as of 2008. Oklahoma has the highest enrollment of Native American students in the nation with 126,078 students in the 2009–10 school year. Oklahoma spent $7,755 for each student in 2008, and was 47th in the nation in expenditures per student, though its growth of total education expenditures between 1992 and 2002 ranked 22nd.The state is among the best in pre-kindergarten education, and the National Institute for Early Education Research rated it first in the United States with regard to standards, quality, and access to pre-kindergarten education in 2004, calling it "a model for early childhood schooling". High school dropout rate decreased from 3.1 to 2.5 percent between 2007 and 2008 with Oklahoma ranked among 18 other states with 3 percent or less dropout rate. In 2004, the state ranked 36th in the nation for the relative number of adults with high school diplomas, though at 85.2 percent, it had the highest rate among Southern states. According to a study conducted by the Pell Institute, Oklahoma ranks 48th in college-participation for low-income students.The University of Oklahoma, The University of Tulsa, Oklahoma State University, the University of Central Oklahoma, and Northeastern State University are the largest institutions of higher education in Oklahoma, each operating through one primary campus and satellite campuses throughout the state. The two state universities, along with Oklahoma City University and the University of Tulsa, rank among the country's best universities.Oklahoma City University School of Law, University of Oklahoma College of Law, and University of Tulsa College of Law are the state's only ABA-accredited institutions. Both University of Oklahoma and University of Tulsa are Tier 1 institutions, with the University of Oklahoma ranked 68th and the University of Tulsa ranked 86th in the nation.Oklahoma holds eleven public regional universities, including Northeastern State University, the second-oldest institution of higher education west of the Mississippi River, also containing the only College of Optometry in Oklahoma and the largest enrollment of Native American students in the nation by percentage and amount. Langston University is Oklahoma's only historically black college. Six of the state's universities were placed in the Princeton Review's list of best 122 regional colleges in 2007, and three made the list of top colleges for best value. The state has 55 post-secondary technical institutions operated by Oklahoma's CareerTech program for training in specific fields of industry or trade.In the 2007–2008 school year, there were 181,973 undergraduate students, 20,014 graduate students, and 4,395 first-professional degree students enrolled in Oklahoma colleges. Of these students, 18,892 received a bachelor's degree, 5,386 received a master's degree, and 462 received a first professional degree. This means the state of Oklahoma produces an average of 38,278-degree-holders per completions component (i.e. July 1, 2007 – June 30, 2008). National average is 68,322 total degrees awarded per completions component.Beginning on April 2, 2018, tens of thousands of K–12 public school teachers went on strike due to lack of funding. According to the National Education Association, teachers in Oklahoma had ranked 49th out of the 50 states in terms of teacher pay in 2016. The Oklahoma Legislature had passed a measure a week earlier to raise teacher salaries by $6,100, but it fell short of the $10,000 raise for teachers, $5,000 raise for other school employees, and $200 million increase in extra education funding many had sought. A survey in 2019 found that the pay raise obtained by the strike lifted the State's teacher pay ranking to 34th in the nation.

Non-English education
The Cherokee Nation instigated a ten-year plan in 2005 that involved growing new speakers of the Cherokee language from childhood as well as speaking it exclusively at home. The plan was part of an ambitious goal that in fifty years would have at least 80% of their people fluent. The Cherokee Preservation Foundation has invested $3 million into opening schools, training teachers, and developing curricula for language education, as well as initiating community gatherings where the language can be actively used.
A Cherokee language immersion school in Tahlequah, Oklahoma educates students from pre-school through eighth grade.

Culture
Oklahoma is placed in the South by the United States Census Bureau, but other definitions place the state at least partly in the Southwest, Midwest, Upland South, and Great Plains. Oklahomans have a high rate of English, Scotch-Irish, German, and Native American ancestry, with 25 different native languages spoken.Because many Native Americans were forced to move to Oklahoma when White settlement in North America increased, Oklahoma has much linguistic diversity. Mary Linn, an associate professor of anthropology at the University of Oklahoma and the associate curator of Native American languages at the Sam Noble Museum, notes Oklahoma also has high levels of language endangerment.Sixty-seven Native American tribes and bands are represented in Oklahoma, including 38 federally recognized tribes, who are headquartered and have tribal jurisdictional areas and/or Indian reservations in the state. Native American tribes, Western ranchers, Southern settlers, and Eastern oil barons have shaped the state's cultural predisposition, and its largest cities have been named among the most underrated cultural destinations in the United States.Residents of Oklahoma are associated with traits of Southern hospitality—the 2006 Catalogue for Philanthropy (with data from 2004) ranks Oklahomans 7th in the nation for overall generosity. The state has also been associated with a negative cultural stereotype first popularized by John Steinbeck's 1939 novel The Grapes of Wrath, which described the plight of uneducated, poverty-stricken Dust Bowl-era farmers deemed "Okies". While the term is often used in a positive manner by Oklahomans, it is still considered a derogatory term by many.

Arts
In the state's largest urban areas, pockets of jazz culture flourish, and Native American, Mexican American, and Asian American communities produce music and art of their respective cultures. The Oklahoma Mozart Festival in Bartlesville is one of the largest classical music festivals on the Southern Plains, and Oklahoma City's Festival of the Arts has been named one of the top fine arts festivals in the nation.The state has a rich history in ballet with five Native American ballerinas attaining worldwide fame. These were Yvonne Chouteau, sisters Marjorie and Maria Tallchief, Rosella Hightower and Moscelyne Larkin, known collectively as the Five Moons. The New York Times rates the Tulsa Ballet as one of the top ballet companies in the United States. The Oklahoma City Ballet and University of Oklahoma's dance program were formed by ballerina Yvonne Chouteau and husband Miguel Terekhov. The university program was founded in 1962 and was the first fully accredited program of its kind in the United States.In Sand Springs, an outdoor amphitheater called "Discoveryland!" (since closed) is the official performance headquarters for the musical Oklahoma! Ridge Bond, native of McAlester, Oklahoma, starred in the Broadway and International touring productions of Oklahoma!, playing the role of "Curly McClain" in more than 2,600 performances. In 1953 he was featured along with the Oklahoma! cast on a CBS Omnibus television broadcast. Bond was instrumental in the Oklahoma! title song becoming the Oklahoma state song and is also featured on the U.S. postage stamp commemorating the musical's 50th anniversary. Historically, the state has produced musical styles such as The Tulsa Sound and western swing, which was popularized at Cain's Ballroom in Tulsa. The building, known as the "Carnegie Hall of Western Swing", served as the performance headquarters of Bob Wills and the Texas Playboys during the 1930s. Stillwater is known as the epicenter of Red Dirt music, the best-known proponent of which is the late Bob Childers.
Prominent theatre companies in Oklahoma include, in the capital city, Lyric Theatre of Oklahoma, Oklahoma City Theatre Company, Carpenter Square Theatre, Oklahoma Shakespeare in the Park, and CityRep. CityRep is a professional company affording equity points to those performers and technical theatre professionals. In Tulsa, Oklahoma's oldest resident professional company is American Theatre Company, and Theatre Tulsa is the oldest community theatre company west of the Mississippi. Other companies in Tulsa include Heller Theatre and Tulsa Spotlight Theater. The cities of Norman, Lawton, and Stillwater, among others, also host well-reviewed community theatre companies.
Oklahoma is in the nation's middle percentile in per capita spending on the arts, ranking 17th, and contains more than 300 museums. The Philbrook Museum of Tulsa is considered one of the top 50 fine art museums in the United States, and the Sam Noble Oklahoma Museum of Natural History in Norman, one of the largest university-based art and history museums in the country, documents the natural history of the region. The collections of Thomas Gilcrease are housed in the Gilcrease Museum of Tulsa, which also holds the world's largest, most comprehensive collection of art and artifacts of the American West.The Egyptian art collection at the Mabee-Gerrer Museum of Art in Shawnee is considered to be the finest Egyptian collection between Chicago and Los Angeles. The Oklahoma City Museum of Art contains the most comprehensive collection of glass sculptures by artist Dale Chihuly in the world, and Oklahoma City's National Cowboy & Western Heritage Museum documents the heritage of the American Western frontier. With remnants of the Holocaust and artifacts relevant to Judaism, the Sherwin Miller Museum of Jewish Art of Tulsa preserves the largest collection of Jewish art in the Southwest United States.

Festivals and events
Oklahoma's centennial celebration was named the top event in the United States for 2007 by the American Bus Association, and consisted of multiple celebrations saving with the 100th anniversary of statehood on November 16, 2007. Annual ethnic festivals and events take place throughout the state such as Native American powwows and ceremonial events, and include festivals (as examples) in Scottish, Irish, German, Italian, Vietnamese, Chinese, Czech, Jewish, Arab, Mexican and African-American communities depicting cultural heritage or traditions.
Oklahoma City is home to a few reoccurring events and festivals. During a ten-day run in Oklahoma City, the State Fair of Oklahoma attracts roughly one million people along with the annual Festival of the Arts. Large national pow wows, various Latin and Asian heritage festivals, and cultural festivals such as the Juneteenth celebrations are held in Oklahoma City each year. The Oklahoma City Pride Parade has been held annually in late June since 1987 in the gay district of Oklahoma City on 39th and Penn. The First Friday Art Walk in the Paseo Arts District is an art appreciation festival held the first Friday of every month. Additionally, an annual art festival is held in the Paseo on Memorial Day Weekend.The Tulsa State Fair attracts more than a million people each year during its ten-day run, and the city's Mayfest festival entertained more than 375,000 in four days during 2007. In 2006, Tulsa's Oktoberfest was named one of the top 10 in the world by USA Today.
Norman plays host to the Norman Music Festival, a festival that highlights native Oklahoma bands and musicians. Norman is also host to the Medieval Fair of Norman, which has been held annually since 1976 and was Oklahoma's first medieval fair. The Fair was held first on the south oval of the University of Oklahoma campus and in the third year moved to the Duck Pond in Norman until the Fair became too big and moved to Reaves Park in 2003. The Medieval Fair of Norman is Oklahoma's "largest weekend event and the third-largest event in Oklahoma, and was selected by Events Media Network as one of the top 100 events in the nation".

Sports
The Oklahoma City Thunder of the National Basketball Association (NBA) is the state's only major league sports franchise. The state had a team in the Women's National Basketball Association, the Tulsa Shock, from 2010 through 2015, but the team relocated to Dallas–Fort Worth after that season and became the Dallas Wings.Oklahoma has teams in several minor leagues, including Minor League Baseball at the Triple-A and Double-A levels (the Oklahoma City Dodgers and Tulsa Drillers, respectively), hockey's ECHL with the Tulsa Oilers, and a number of indoor football leagues. In the last-named sport, the state's most notable team was the Tulsa Talons, which played in the Arena Football League until 2012, when the team was moved to San Antonio, Texas. The Oklahoma Defenders replaced the Talons as Tulsa's only professional arena football team, playing the CPIFL. The Oklahoma City Blue, of the NBA G League, relocated to Oklahoma City from Tulsa in 2014, where they were formerly known as the Tulsa 66ers. Tulsa is the base for the Tulsa Revolution, which plays in the American Indoor Soccer League. Enid and Lawton host professional basketball teams in the USBL and the CBA.

Collegiate athletics are a popular draw in the state. The state has four schools that compete at the highest level of college sports, NCAA Division I. The most prominent are the state's two members of the Big 12 Conference, one of the so-called Power Five conferences of the top tier of college football, Division I FBS. The University of Oklahoma and Oklahoma State University average well over 50,000 fans attending their football games, and Oklahoma's football program ranked 12th in attendance among American colleges in 2010, with an average of 84,738 people attending its home games. The two universities meet several times each year in rivalry matches known as the Bedlam Series, which are some of the greatest sporting draws to the state. Sports Illustrated magazine rates Oklahoma and Oklahoma State among the top colleges for athletics in the nation.Two private institutions in Tulsa, the University of Tulsa and Oral Roberts University; are also Division I members. Tulsa competes in FBS football and other sports in the American Athletic Conference, while Oral Roberts, which does not sponsor football, is a member of the Summit League. In addition, 12 of the state's smaller colleges and universities compete in NCAA Division II as members of three different conferences, and eight other Oklahoma institutions participate in the NAIA, mostly within the Sooner Athletic Conference.Regular LPGA tournaments are held at Cedar Ridge Country Club in Tulsa, and major championships for the PGA or LPGA have been played at Southern Hills Country Club in Tulsa, Oak Tree Country Club in Oklahoma City, and Cedar Ridge Country Club in Tulsa. Rated one of the top golf courses in the nation, Southern Hills has hosted five PGA Championships, including one in 2022, and three U.S. Opens, the most recent in 2001. Rodeos are popular throughout the state, and Guymon, in the state's panhandle, hosts one of the largest in the nation.ESPN called Oklahoma City "the center of the softball universe", specifically referring to the fast-pitch version, in a 2020 story. Oklahoma City is home to the governing body of the sport in the United States, USA Softball, which has its headquarters in a complex that also includes the USA Softball Hall of Fame Stadium. It annually hosts the Women's College World Series, the eight-team final round of the NCAA Division I softball tournament.Wrestling is a sport with a strong tradition in Oklahoma. Oklahoma State has the most NCAA national championships of any collegiate team with 34, with the Oklahoma Sooners having 7 NCAA wrestling titles. The National Wrestling Hall of Fame and Museum is headquartered in Stillwater, Oklahoma.

Current professional teams
Health
Oklahoma was the 21st-largest recipient of medical funding from the federal government in 2005, with health-related federal expenditures in the state totaling $75,801,364; immunizations, bioterrorism preparedness, and health education were the top three most funded medical items. Instances of major diseases are near the national average in Oklahoma, and the state ranks at or slightly above the rest of the country in percentage of people with asthma, diabetes, cancer, and hypertension.In 2000, Oklahoma ranked 45th in physicians per capita and slightly below the national average in nurses per capita, but was slightly above the national average in hospital beds per 100,000 people and above the national average in net growth of health services over a twelve-year period. One of the worst states for percentage of insured people, nearly 25 percent of Oklahomans between the age of 18 and 64 did not have health insurance in 2005, the fifth-highest rate in the nation.Oklahomans are in the upper half of Americans in terms of obesity prevalence, and the state is the 5th most obese in the nation, with 30.3 percent of its population at or near obesity. Oklahoma ranked last among the 50 states in a 2007 study by the Commonwealth Fund on health care performance.The OU Medical Center, Oklahoma's largest collection of hospitals, is the only hospital in the state designated a Level I trauma center by the American College of Surgeons. OU Medical Center is on the grounds of the Oklahoma Health Center in Oklahoma City, the state's largest concentration of medical research facilities.The Cancer Treatment Centers of America at Southwestern Regional Medical Center in Tulsa is one of four such regional facilities nationwide, offering cancer treatment to the entire southwestern United States, and is one of the largest cancer treatment hospitals in the country. The largest osteopathic teaching facility in the nation, Oklahoma State University Medical Center at Tulsa, also rates as one of the largest facilities in the field of neuroscience.
On June 26, 2018, Oklahoma made marijuana legal for medical purposes, making it one of the most conservative states to approve medical marijuana.

Life expectancy
The residents of Oklahoma have a lower life expectancy than the U.S. national average. In 2014, males in Oklahoma lived an average of 73.7 years compared to a male national average of 76.7 years and females lived an average of 78.5 years compared to a female national average of 81.5 years. Moreover, increases in life expectancy have been below the national average. Male life expectancy in Oklahoma between 1980 and 2014, increased by an average of 4.0 years, compared to a male national average of a 6.7 year increase. Life expectancy for females in Oklahoma between 1980 and 2014, increased by 1.0 years, compared to a female national average of a 4.0 year increase.Using  2016–2018 data, the Robert Wood Johnson Foundation calculated that life expectancy (all sexes) for Oklahoma counties ranged from 71.2 years for Okfuskee County to 79.7 years for Cimarron and Logan counties. Life expectancy for the state as a whole was 76.0 years.

Impact of Covid
As of December 22, 2022, Oklahoma has been impacted more by the Covid pandemic (2020-?) than the average U.S. state. Statistics for the U.S. as a whole are 331 deaths per 100,000 population with 68 percent of the population fully vaccinated.  The comparable statistics for Oklahoma are 405 deaths per 100,000 population with 59 percent of the population fully vaccinated; 16,041 deaths from Covid have been recorded in Oklahoma. A wide variation in deaths from Covid exists among Oklahoma counties. Greer County recorded the highest death rate of .00753 (753 deaths per 100,000 residents). Payne County recorded the lowest death rate of .00231 (231 deaths per 100,000 residents.

Media
Oklahoma City and Tulsa are the 45th- and 61st-largest media markets in the United States as ranked by Nielsen Media Research. The state's third-largest media market, Lawton-Wichita Falls, Texas, is ranked 149th nationally by the agency. Broadcast television in Oklahoma began in 1949 when KFOR-TV (then WKY-TV) in Oklahoma City and KOTV-TV in Tulsa began broadcasting a few months apart. Currently, all major American broadcast networks have affiliated television stations in the state.The state has two primary newspapers. The Oklahoman, based in Oklahoma City, is the largest newspaper in the state and 54th-largest in the nation by circulation, with a weekday readership of 138,493 and a Sunday readership of 202,690. The Tulsa World, the second-most widely circulated newspaper in Oklahoma and 79th in the nation, holds a Sunday circulation of 132,969 and a weekday readership of 93,558. Oklahoma's first newspaper was established in 1844, called the Cherokee Advocate, and was written in both Cherokee and English. In 2006, there were more than 220 newspapers in the state, including 177 with weekly publications and 48 with daily publications.The state's first radio station, WKY in Oklahoma City, began broadcasting in 1920. In 2006, there were more than 500 radio stations in Oklahoma broadcasting with various local or nationally owned networks. Five universities in Oklahoma operate non-commercial, public radio stations/networks.Oklahoma has a few ethnic-oriented TV stations broadcasting in Spanish and Asian languages, and there is some Native American programming. TBN, a Christian religious television network, has a studio in Tulsa, and built its first entirely TBN-owned affiliate in Oklahoma City in 1980.

Transportation
Transportation in Oklahoma is generated by an anchor system of Interstate Highways, inter-city rail lines, airports, inland ports, and mass transit networks. Situated along an integral point in the United States Interstate network, Oklahoma contains three primary Interstate highways and four auxiliary Interstate Highways. In Oklahoma City, Interstate 35 intersects with Interstate 44 and Interstate 40, forming one of the most important intersections along the United States highway system.More than 12,000 miles (19,000 km) of roads make up the state's major highway skeleton, including state-operated highways, ten turnpikes or major toll roads, and the longest drivable stretch of Route 66 in the nation. In 2008, Interstate 44 in Oklahoma City was Oklahoma's busiest highway, with a daily traffic volume of 123,300 cars. In 2010, the state had the nation's third-highest number of bridges classified as structurally deficient, with nearly 5,212 bridges in disrepair, including 235 National Highway System Bridges.Oklahoma's largest commercial airport is Will Rogers World Airport in Oklahoma City, averaging a yearly passenger count of more than 3.5 million (1.7 million boardings) in 2010. Tulsa International Airport, the state's second-largest commercial airport, served more than 1.3 million boardings in 2010. Between the two, six airlines operate in Oklahoma. In terms of traffic, R. L. Jones Jr. (Riverside) Airport in Tulsa is the state's busiest airport, with 335,826 takeoffs and landings in 2008. Oklahoma has more than 150 public-use airports.Oklahoma is connected to the nation's rail network via Amtrak's Heartland Flyer, its only regional passenger rail line. It currently stretches from Oklahoma City to Fort Worth, Texas, though lawmakers began seeking funding in early 2007 to connect the Heartland Flyer to Tulsa.Two inland ports on rivers serve Oklahoma: the Port of Muskogee and the Tulsa Port of Catoosa. The Tulsa Port of Catoosa is the one of the United States' most inland international ports, at head of navigation of the McClellan–Kerr Arkansas River Navigation System, which connects barge traffic from Tulsa and Muskogee to the Mississippi River.  The port ships over two million tons of goods annually and is a designated foreign trade zone.

Law and government
Oklahoma is a constitutional republic with a government modeled after the federal government of the United States, with executive, legislative, and judicial branches. The state has 77 counties with jurisdiction over most local government functions within each respective domain, five congressional districts, and a voting base with a majority in the Republican Party. State officials are elected by plurality voting in the state of Oklahoma.
Oklahoma has capital punishment as a legal sentence, and the state has had (between 1976 through mid-2011) the highest per capita execution rate in the nation. Authorized methods of execution include the Electric chair, the Gas chamber and the Firing Squad.In a 2020 study, Oklahoma was ranked as the 14th most difficult state for citizens to vote in.

State government
The Legislature of Oklahoma consists of the Senate and the House of Representatives. As the lawmaking branch of the state government, it is responsible for raising and distributing the money necessary to run the government. The Senate has 48 members serving four-year terms, while the House has 101 members with two-year terms. The state has a term limit for its legislature that restricts any one person to twelve cumulative years service between both legislative branches.Oklahoma's judicial branch consists of the Oklahoma Supreme Court, the Oklahoma Court of Criminal Appeals, and 77 District Courts that each serve one county. The Oklahoma judiciary also contains two independent courts: a Court of Impeachment (for impeachment trials) and the Oklahoma Court on the Judiciary. Oklahoma has two courts of last resort: the state Supreme Court hears civil cases, and the state Court of Criminal Appeals hears criminal cases (this split system exists only in Oklahoma and neighboring Texas). Judges of those two courts, as well as the Court of Civil Appeals are appointed by the Governor upon the recommendation of the state Judicial Nominating Commission, and are subject to a non-partisan retention vote on a six-year rotating schedule.The executive branch consists of the Governor, their staff, and other elected officials. The principal head of government, the Governor is the chief executive of the Oklahoma executive branch, serving as the ex officio Commander-in-chief of the Oklahoma National Guard when not called into Federal use and reserving the power to veto bills passed through the Legislature. The responsibilities of the Executive branch include submitting the budget, ensuring state laws are enforced, and ensuring peace within the state is preserved.

Local government
The state is divided into 77 counties that govern locally, each headed by a three-member council of elected commissioners, a tax assessor, clerk, court clerk, treasurer, and sheriff. While each municipality operates as a separate and independent local government with executive, legislative and judicial power, county governments maintain jurisdiction over both incorporated cities and non-incorporated areas within their boundaries, and have executive power but no legislative or judicial power. Both county and municipal governments collect taxes, employ a separate police force, hold elections, and operate emergency response services within their jurisdiction. Other local government units include school districts, technology center districts, community college districts, rural fire departments, rural water districts, and other special use districts.
Thirty-nine Native American tribal governments are based in Oklahoma, each holding limited powers within designated areas. While Indian reservations are typical in most of the United States, they are not present in Oklahoma, tribal governments hold land granted during the Indian Territory era, but with limited jurisdiction and no control over state governing bodies such as municipalities and counties. Tribal governments are recognized by the United States as quasi-sovereign entities with executive, judicial, and legislative powers over tribal members and functions, but are subject to the authority of the United States Congress to revoke or withhold certain powers. The tribal governments are required to submit a constitution and any subsequent amendments to the United States Congress for approval.Oklahoma has 11 substate districts including the two large Councils of Governments, INCOG in Tulsa (Indian Nations Council of Governments) and ACOG (Association of Central Oklahoma Governments).

National politics
During the first half-century of statehood, Oklahoma was considered a Democratic stronghold, being carried by the Republican Party in only two presidential elections (1920 and 1928). After the 1948 election, the state turned firmly Republican. Although registered Republicans were a minority in the state until 2015, Oklahoma has been carried by Republican presidential candidates in all but one election since 1952: Lyndon B. Johnson's 1964 landslide victory. Every single county in the state has been won by the Republican candidate in each election since 2004.  Oklahoma City was the largest city in the United States carried by Republican Donald Trump in both the 2016 and 2020 elections.
Democrats are strongest in the eastern part of the state and Little Dixie, as well as the most heavily African American and inner parts of Oklahoma City and Tulsa. In addition, precincts with high concentrations of Native Americans (who form 8.6% of the state's population) also tend to support the Democratic Party.Following the 2000 census, the Oklahoma delegation to the U.S. House of Representatives was reduced from six to five representatives, each serving one congressional district. Oklahoma has had an all-Republican congressional delegation since 2021, having previously had one from 2013 to 2019.

Military
State symbols
State law codifies Oklahoma's state emblems and honorary positions; the Oklahoma Senate or House of Representatives may adopt resolutions designating others for special events and to benefit organizations. In 2012 the House passed HCR 1024, which would change the state motto from "Labor Omnia Vincit" to "Oklahoma—In God We Trust!" The author of the resolution stated a constituent researched the Oklahoma Constitution and found no "official" vote regarding "Labor Omnia Vincit", therefore opening the door for an entirely new motto.

See also
Oklahoma portal
 United States portal
Index of Oklahoma-related articles
Outline of Oklahoma

Notes
References
Further reading
Baird, W. David; Danney Goble (1994). The Story of Oklahoma. Norman: University of Oklahoma Press. ISBN 978-0-8061-2650-0.
Dale, Edward Everett; Morris L. Wardell (1948). History of Oklahoma. New York: Prentice-Hall.
Gibson, Arrell Morgan (1981). Oklahoma: A History of Five Centuries (2nd ed.). Norman: University of Oklahoma Press. ISBN 978-0-8061-1758-4.
Goble, Danney (1980). Progressive Oklahoma: The Making of a New Kind of State. Norman: University of Oklahoma Press. ISBN 978-0-8061-1510-8.
Gunther, John (1947). "Oklahoma and the Indians". Inside U.S.A. New York City, London: Harper & Brothers. pp. 869–885.
Jones, Stephen (1974). Oklahoma Politics in State and Nation (vol. 1 (1907–62) ed.). Enid, Okla.: Haymaker Press.
Joyce, Davis D., ed. (1994). An Oklahoma I Had Never Seen Before: Alternative Views of Oklahoma History. Norman: University of Oklahoma Press. ISBN 978-0-8061-2599-2.
Morgan, Anne Hodges; Morgan, H. Wayne, eds. (1982). Oklahoma: New Views of the Forty-sixth State. Norman: University of Oklahoma Press. ISBN 978-0-8061-1651-8.
Morgan, David R.; Robert E. England; George G. Humphreys (1991). Oklahoma Politics and Policies: Governing the Sooner State. Lincoln: University of Nebraska Press. ISBN 978-0-8032-3106-1.
Morris, John W.; Charles R. Goins; Edwin C. McReynolds (1986). Historical Atlas of Oklahoma (3rd ed.). Norman: University of Oklahoma Press. ISBN 978-0-8061-1991-5.
Wishart, David J., ed. (2004). Encyclopedia of the Great Plains. Lincoln: University of Nebraska Press. ISBN 978-0-8032-4787-1. complete text online; 900 pages of scholarly articles

External links
Government
Official website
Oklahoma Legislative Branch
Oklahoma Department of Commerce
Oklahoma Department of Human Services
Oklahoma Department of Transportation

Tourism and recreation
Official Oklahoma Tourism Info
Oklahoma State Parks
Red Earth Archived January 29, 2021, at the Wayback Machine
Woody Guthrie Folk Festival

Culture and history
Oklahoma State Guide from the Library of Congress
Oklahoma Arts Council
Oklahoma Theatre Association
Oklahoma Oral History Research Program
Encyclopedia of Oklahoma History and Culture
Voices of Oklahoma Oral History Project

Maps and demographics
Oklahoma QuickFacts Geographic and Demographic information
State highway maps
Oklahoma Genealogical Society
Realtime USGS geographic, weather, and geologic information Archived May 1, 2012, at the Wayback Machine
 Geographic data related to Oklahoma at OpenStreetMap
Oklahoma Digital Maps: Digital Collections of Oklahoma and Indian Territory