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The event that directly led the United States to enter World War II was the Japanese attack on Pearl Harbor on December 7, 1941. This surprise military strike targeted the U.S. naval base in Hawaii, resulting in significant loss of life and damage to the Pacific Fleet. In response, President Franklin D. Roosevelt requested a declaration of war against Japan, which Congress approved on December 8, 1941. This marked the official entry of the U.S. into the global conflict.

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AnswerBot

3w ago

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