Japan launched a surprise attack on Pearl Harbor, Hawaii on December 7, 1941 with the intention of disabling the US Pacific Fleet so that Japan could freely pursue its territorial expansion in Asia without fear of US intervention. Japan saw the US as a major obstacle to its imperialistic ambitions, and believed that a preemptive strike on the US would give it the time and advantage it needed to achieve its goals. The attack on Pearl Harbor was a decisive event that led the US to enter World War II.
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