Final answer:
The attack that caused the United States to enter World War II happened in Hawaii at Pearl Harbor.
Step-by-step explanation:
The location of the attack that caused the United States to enter World War II was Hawaii. The attack took place on December 7, 1941, when the Japanese military launched a surprise attack on the U.S. naval base at Pearl Harbor. This attack prompted the United States to officially enter the war and declare war on Japan the following day.
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