Answer:
The Japanese air force attacked the American naval base at Pearl Harbor on December 7, 1941, in an attempt to intimidate the United States into staying out of World War II. At the time, Japan was involved in a military campaign to expand its empire in Southeast Asia and the Pacific. The United States had imposed economic sanctions on Japan in response to its aggressive actions, including the occupation of French Indochina.
Japan's military leaders believed that the only way to achieve their goals in the region was to neutralize the United States, which had the most powerful navy in the Pacific. The attack on Pearl Harbor was intended to cripple the US Pacific Fleet and discourage any American resistance to Japan's expansion.
While the US had been moving towards war with Japan, the attack on Pearl Harbor took the country by surprise and led to the US declaring war on Japan the following day. The attack also drew the United States fully into World War II, as it led to Germany declaring war on the United States on December 11, 1941.
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