It is generally considered that the Pacific War began on 7/8 December 1941, on which date Japan invaded Thailand and attacked the British possessions of Malaya, Singapore, and Hong Kong as well as the United States military bases in Hawaii, Wake Island, Guam and the Philippines. Some historians contend that the conflict in Asia can be dated back to 7 July 1937 with the beginning of the Second Sino-Japanese War between the Empire of Japan and the Republic of China, or possibly 19 September 1931, beginning with the Japanese invasion of Manchuria. However, it is more widely accepted that the Pacific War itself started in early December 1941, with the Sino-Japanese War then becoming part of it as a theater of the greater World War II.[nb 9] 

The Pacific War saw the Allied powers pitted against the Empire of Japan, the latter briefly aided by Thailand and to a much lesser extent by its Axis allies, Germany and Italy. The war culminated in the atomic bombings of Hiroshima and Nagasaki, and other large aerial bomb attacks by the United States Army Air Forces, accompanied by the Soviet invasion of Manchuria on 8 August 1945, resulting in the Japanese announcement of intent to surrender on 15 August 1945. The formal and official surrender of Japan took place aboard the battleship USS Missouri in Tokyo Bay on 2 September 1945. Following its defeat, Japan's Shinto Emperor stepped down as the divine leader through the Shinto Directive, because the Allied Powers believed this was the major political cause of Japan's military aggression and deconstruction process soon took place to install a new liberal-democratic constitution to the Japanese public as the current Constitution of Japan.
What country was invaded at the onset of the War?
Who were the allied against?
And who aided their enemy?
What was the culminating point of the war?
Which is the only country to ever drop atomic bombs?
And how many times did they do this?
And where did they drop these destructive atom bombs?
What did Japan do after this?
On which day was the formal white flag flown?
Where did it happen?
What was Japan's emperor forced to do?
Who was the was on July 7, 1937 between?
Thailand
on which date Japan invaded Thailand 
the Empire of Japan
Allied powers pitted against the Empire of Japan
Thailand, Germany, and Italy
Thailand and to a much lesser extent by its Axis allies, Germany and Italy.
the atomic bombings
The war culminated in the atomic bombings of Hiroshima and Nagasaki,
the United States
the atomic bombings of Hiroshima and Nagasaki, and other large aerial bomb attacks by the United States Army Air Forces,
twice
The war culminated in the atomic bombings of Hiroshima and Nagasaki, and other large aerial bomb attacks by the United States Army Air Forces,
Hiroshima and Nagasak
 The war culminated in the atomic bombings of Hiroshima and Nagasaki, and other large aerial bomb attacks by the United States Army Air Forces,
they surrendered
 resulting in the Japanese announcement of intent to surrender on 15 August 1945
2 September 1945
The formal and official surrender of Japan took place aboard the battleship USS Missouri in Tokyo Bay on 2 September 1945.
aboard the USS Missouri
The formal and official surrender of Japan took place aboard the battleship USS Missouri in Tokyo Bay on 2 September 1945. 
step down
Following its defeat, Japan's Shinto Emperor stepped down as the divine leader through the Shinto Directive
Japan and China
 7 July 1937 with the beginning of the Second Sino-Japanese War between the Empire of Japan and the Republic of China