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Pearl Harbor (see more photos) on Oahu, Hawaii, is a significant historical location. It was here where the Japanese attacked the U.S. Pacific fleet on December 7, 1941, which led the United States to enter World War II. Today, Pearl Harbor (including the Arizona Memorial) is the most-visited destination on Oahu, with more than 1.5 million visitors per year.
The attack on Pearl Harbor was a surprise military strike by the Imperial Japanese Navy against the United States naval base at Pearl Harbor, in the United States Territory of Hawaii, on the morning of December 7, 1941. The attack led to the United States' entry into World War II. Japan intended the attack as a preventive action to keep the U.S. Pacific Fleet from interfering with military actions the Empire of Japan planned in Southeast Asia against overseas territories of the United Kingdom, the Netherlands, and the United States.