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The attack on Pearl Harbor was a surprise military strike conducted by the Imperial Japanese Navy against the United States naval base at Pearl Harbor, Hawaii, on December 7, 1941. The attack was a major factor in the United States' entry into World War II. The primary cause of the attack was Japan's desire to expand its empire and control the Pacific region, as well as its need for resources that were being embargoed by the US. The immediate effect of the attack was the death of 2,403 Americans and the destruction of eight battleships and other vessels. The US government responded to the attack by declaring war on Japan the next day. The attack had far-reaching consequences, leading to a change in US foreign policy, increased military spending and mobilization, and ultimately, the defeat of Japan and the end of the war. The attack on Pearl Harbor remains one of the most significant events in modern American history, serving as a powerful reminder of the importance of national security and preparedness.