The attack on Pearl Harbor led to the United States entering World War II and strengthened the Allied nations.
The attack on Pearl Harbor changed the course of World War II by prompting the United States to enter the war. This entry increased the strength of the Allied nations, leading to a more formidable opposition against the Axis powers. Additionally, the attack shifted the focus of the United States towards the war in the Pacific, aiding in the defeat of the Axis forces.
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