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The United States ended its isolationism and entered World War II following the Japanese attack on Pearl Harbor on December 7, 1941. This surprise military strike resulted in significant loss of life and damage to the U.S. Pacific Fleet, galvanizing public opinion in favor of entering the war. In response, the U.S. declared war on Japan the following day, subsequently leading to declarations of war against Germany and Italy. The attack marked a pivotal shift from isolationism to active involvement in global conflict.

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