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The United States of America joined in the World War II after 7th of December, 1941; the day on which it's Pearl Harbor was attacked. Prior to this America had stayed away from the war and wasn't a part of either the Allied or the Axis powers. However, when Japan destroyed almost the entire American navy with a surprise bombing of Pearl Harbor which was of its primary naval bases, the U.S joined in fighting along side France and Britain.

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14y ago

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Germany declared war on the US on 11 December 1941

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11y ago
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1917 ww1

1941 ww2

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13y ago
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Q: The US entered the war in what year?
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