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The US entered world war 2 after

User El Hoss
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Answer:

Pearl Harbor was the event that prompted America to join the war

User AndriusZ
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Global in scale and in its repercussions, World War II created a new world at home and abroad. ... Although the war began with Nazi Germany's attack on Poland in September 1939, the United States did not enter the war until after the Japanese bombed the American fleet in Pearl Harbor, Hawaii, on December 7, 1941.

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