The Attack on Pearl Harbor occurred on December 7, 1941, as Japan sought to advance its expansionist goals in the Pacific. The attack was preceded by months of negotiations between the US and Japan over the future of the Pacific region. Japanese demands included that the United States end its sanctions against Japan, cease aiding China in the Second Sino-Japanese War, and allow Japan access to the resources of the Dutch East Indies. The US had recently issued the Hull note, which stated American desire that Japan withdraw from China and French Indochina. At the time of the attack, the United States was a neutral country in World War II, and the Pacific Fleet had been based at Pearl Harbor since 1940.
The attack was launched on December 7, 1941, as a surprise military strike on the United States Pacific Fleet at its naval base at Pearl Harbor on Oahu, Hawaii Territory. The air raid was launched from aircraft carriers. Isoroku Yamamoto, commander of the Japanese Combined Fleet, planned the attack as a pre-emptive strike designed to prevent the Pacific Fleet from interfering with Japanese operations. Japan dispatched its naval attack group on November 26, 1941, demonstrating the deliberate planning and coordination behind the operation. The Japanese military leadership referred to the attack by multiple names during planning and execution: the Hawaii Operation, Operation AI, and Operation Z.
The attack on Pearl Harbor prompted the United States to declare war on Japan the next day, marking America's entry into World War II. This single military engagement transformed the United States from a neutral observer into an active combatant in the global conflict, fundamentally altering the course of both American history and World War II itself.
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