The attack on Pearl Harbor led to the United States joining World War II, strengthening the Allies and contributing to the defeat of the Axis powers.
The attack on Pearl Harbor changed the course of World War II by prompting the United States' entry into the war. Prior to the attack, the U.S. was trying to avoid involvement in the conflict raging in Europe and Asia. However, after the attack, the American people overwhelmingly supported joining the war, which significantly strengthened the Allied forces, leading to the eventual defeat of the Axis powers.
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