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World War II is generally considered to have started when Hitler invaded Poland September 1st, 1939. This triggered the entry of France and Britain and started a general war in Europe. World War II in the Pacific is generally considered to have started December 7th, 1941, when the Japanese Empire attack US forces at Pearl Harbor, as well as other targets in the Pacific region, although Japan had been waging war in China as early as 1931.

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13y ago

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