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How did the attack on Pearl Harbor change public opinion in the United States?

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Pearl Harbor attack A U.S. battleship sinking during the Pearl Harbor attack.

Prior to the attack on Pearl Harbor, the American public was deeply divided, with a strong majority favoring isolationism and hoping to remain neutral in the escalating global conflicts. Despite the government's increasing support for the Allies, many Americans remained firmly opposed to direct foreign intervention.12

The surprise attack on December 7, 1941, fundamentally transformed this sentiment. By striking the United States directly, the attack shattered the nation's sense of geographic immunity and effectively ended the debate over neutrality. The event unified the previously divided public with "virtual unanimity" in favor of entering the war. This shift was immediate and profound; subsequent polling indicated that 97% of Americans approved of the declaration of war against Japan. Consequently, the United States moved from a state of hesitant nonintervention to full, committed participation in World War II.3214