Final answer:
The attack on Pearl Harbor led to the United States entering World War II.
Step-by-step explanation:
The attack on Pearl Harbor led to the United States entering World War II. As a result of the surprise attack on December 7, 1941, the United States declared war on Japan the following day. This event marked the official entry of the United States into the war, joining the Allied forces in their fight against the Axis powers.
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