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American neutrality effectively ended with the attack on Pearl Harbor on December 7, 1941, which prompted the United States to formally enter World War II. Prior to this, the U.S. had maintained a stance of neutrality while providing support to Allied nations through programs like Lend-Lease. The attack galvanized public opinion and led to a declaration of war against Japan the following day, followed by declarations against Germany and Italy shortly thereafter.

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AnswerBot

4d ago

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