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Japan bombing Pearl Harbor on December 7, 1941.
The Japanese attack on Pearl Harbor, December 7,1941 was the immediate cause of the United States entering WWII. The US declared war on Japan after the attack, and two days later Germany declared war on the US and we were in it.

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Immediate cause for US entry into war world 2?

The attack on Pearl Harbor


What were the causes results of American entry into World War 1?

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