Come up with a fictional history of the United States in an alternate timeline where the US became a free country in 1776, but the events of history do not come to pass, and a different set of events played out that led to a very different outcome.
In 1776, the United States became an independent country after separating from England and escaping the tyrannical rule of King George III. The fledgling country flourished quickly, with the expansion of territory from the original thirteen colonies (founded by the migrating Pilgrims) to 20 states, which included the newly acquired territories of Texas and Minnesota in 1812.

By 1905, the United States had become a burgeoning superpower akin to the United Kingdom; however, in 1906, an unprovoked attack by Japan (who was seeking to ally with the United Kingdom) saw parts of the United States coming under the control of the Japanese-aligned UK. At the end of the war, dubbed "the Colonial War of 1906," the UK granted Japan the spoils of war, including the acquisition of the states of Kafuniya on the West Coast, as well as the large expanse of land to the north, called Kaneda.

In 1951, the United States (still comprising 20 states) was renamed "the Sovereign Territories of America" by Japan and the UK, who had divided the remaining American lands into North and South, where Japan took control of the northern lands (including Kaneda and half of Kafuniya) while the UK, seeking to expand further south, took control of the Aztec lands. However, this strategy was met with resistance by smaller splinter groups from the Sovereign Territories of America who migrated to the Aztec lands shortly after the colonization of the East Coast, where the weather and crops were more agreeable to them. 

Another war, referred to as the Aztec War of 1953, came to an end in 1956 when both the Sovereign Territories and the UK agreed to a truce and fostered trade of cash crops on the Aztec lands such as cactus, corn, fabrics, and gemstone ores (quartz, sphene) for the creation of a new class of electronics, including flying cars.