Final answer:
The Japanese airplanes attacked the American base at Pearl Harbor on December 7, 1941.
Step-by-step explanation:
True
On December 7, 1941, Japanese airplanes launched a surprise attack on the American naval base at Pearl Harbor in Hawaii. The attack was a major event in World War II and caused significant damage to the US Pacific Fleet. This event marked the entry of the United States into the war, as it prompted the US to declare war on Japan the following day.
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