The Attack on Pearl Harbor occurred on December 7, 1941, when the Empire of Japan launched a surprise military strike against the United States Pacific Fleet at its naval base on Oahu, Hawaii Territory. At the time of the attack, the United States was a neutral country in World War II. The strike was preceded by months of negotiations between the US and Japan over the future of the Pacific, during which Japan demanded that the US end its sanctions, cease aiding China in the Second Sino-Japanese War, and allow Japan access to resources in the Dutch East Indies. Japan dispatched its naval attack group on November 26, 1941, shortly before the US delivered the Hull note, which expressed American desires that Japan withdraw from China and French Indochina.
The Japanese military leadership, under the command of Isoroku Yamamoto, commander of the Japanese Combined Fleet, planned and executed the attack as a pre-emptive strike. Yamamoto designed the operation to prevent the Pacific Fleet, which had been based at Pearl Harbor since 1940, from interfering with Japanese military objectives. The Japanese referred to the operation by multiple designations: the Hawaii Operation, Operation AI, and Operation Z during its planning phase. The air raid was launched from aircraft carriers, demonstrating Japan's commitment to a coordinated naval assault.
The attack on Pearl Harbor prompted an immediate and significant shift in American foreign policy. The United States declared war on Japan the following day, December 8, 1941, formally ending American neutrality and bringing the nation into World War II. This single military engagement transformed the geopolitical landscape and marked a turning point in both the Pacific Theater and the broader global conflict.
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