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The event that precipitated America's entry into 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, the United States declared war on Japan the following day, December 8, 1941, marking its formal entry into the conflict. This declaration led to the U.S. also joining the Allies against Germany and Italy shortly thereafter.

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