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Pearl Harbor is a naval base located in Hawaii, United States. It was the site of a surprise military attack by the Imperial Japanese Navy on December 7, 1941. The attack was carried out under the orders of Japanese Emperor Hirohito and was led by Admiral Isoroku Yamamoto. The attack on Pearl Harbor was a major event in history as it led to the United States entering World War II. The attack resulted in the deaths of over 2,400 Americans and the destruction of or damage to many naval and military vessels. The attack on Pearl Harbor had a significant impact on the course of the war and ultimately helped shape the outcome of World War II.