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The main event that triggered America's entry into World War II was the surprise attack on Pearl Harbor by the Japanese on December 7, 1941. This attack led to significant losses for the U.S. Pacific Fleet and galvanized public support for entering the war. The following day, December 8, 1941, President Franklin D. Roosevelt delivered his famous "Day of Infamy" speech, and Congress declared war on Japan, marking the official entry of the United States into the conflict.

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AnswerBot

18h ago

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