The Pacific War, sometimes called the Asia-Pacific War, was the scene of World War II, which took place in East Asia, the Pacific Ocean, the Indian Ocean, and Oceania. Geographically, it was the largest theater of the war, including the huge war rampage in the Pacific, the war in the Southwest Pacific, the Second Sino-Japanese War, and the Soviet-Japanese War.
The Second Sino-Japanese War between the Empire of Japan and the Republic of China had been ongoing since July 7, 1937, with hostilities extending as far back as September 19, 1931, with the Japanese invasion of Manchuria. The Pacific War itself began on December 7 (December 8 Japanese time) 1941, when the Japanese simultaneously attacked United States military bases in Hawaii, Wake Island, Guam, and the Philippines and invaded Thailand and the British colonies of Malaya, Singapore and Hong Kong.
In the Pacific War, the Allies opposed Japan, aided by Thailand and to a lesser extent by Axis allies. The fighting consisted of some of the largest naval battles in history and incredibly fierce battles and war crimes across Asia and the Pacific Islands resulting in huge loss of life. The war culminated in massive Allied air raids on Japan, including the dropping of atomic bombs on Hiroshima and Nagasaki, accompanied by a declaration of war by the Soviet Union and the invasion of Manchuria and other territories on August 9, 1945, causing the Japanese to announce their intention to surrender on August 15, 1945.
