Final answer:
Japan's attack on Pearl Harbor led to the deaths of more than 2,400 Americans and the US entry into World War II.
Step-by-step explanation:
The subject of this question is History. The question is asking about Japan's attack on a US naval base in Hawaii on December 7, 1941, which is commonly known as the attack on Pearl Harbor. This attack resulted in the deaths of more than 2,400 Americans and marked the entry of the United States into World War II.
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