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The US entered World War 2 after the Japanese attack on Pearl Harbour on

7 December 1941 and got out after the official surrender of Japan on 2 September 1945.

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12y ago

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They joined as a result of the Japanese bombing in Pearl Harbor, the US joined the war the day after Pearl Harbor on Dec 8th, 1941. The official start of World War II was September 1st, 1939.

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8y ago
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Q: When and why did the US enter World War II?
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