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The correct answer to the question "What was the location of the attack that caused the United States to enter World War II?" is:
B. Japan
Explanation:
1. The attack that led the United States to enter World War II occurred on December 7, 1941.
2. The Japanese launched a surprise military strike on the U.S. naval base at Pearl Harbor in Hawaii.
3. This attack resulted in significant damage to the U.S. Pacific Fleet and led to the United States declaring war on Japan the following day, officially entering World War II.
Therefore, the location of the attack that caused the United States to enter World War II was Japan, specifically at Pearl Harbor in Hawaii.
I hope this helps clarify the question for you! If you have any more questions or need further assistance, feel free to ask.