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The Japanese desire to create an Asian empire was the prime motivation behind the Japanese invasion of Manchuria in 1931, Japanese attacks on eastern China in 1937, and the Japanese occupation of much of French Indochina in 1941. As a result of Japanese actions in Southeast Asia, Roosevelt froze all Japanese assets in the United States, cut off the sale of oil to Japan, and closed the Panama Canal to Japanese ships.

From July 1941 until the beginning of December, near-constant negotiations took place between diplomats of Japan and the United States. The Japanese desperately wanted to regain normal trade relations with the United States, but American diplomats insisted that the Japanese leave China first, which the Japanese were unwilling to do. Most Japanese military and civilian leaders were convinced that the Japanese could never achieve their goal of a Pacific empire as long as the United States was active militarily in the region. By December 1 the planning was complete for the Japanese attack on Pearl Harbor.

A few revisionist historians believe that Franklin Roosevelt knew of the impending attack on Pearl Harbor, These historians maintain that Roosevelt was acutely aware that many Americans were still opposed to American entry into war, hut that an event such as Pearl Harbor would put the entire country squarely behind the war effort. The vast majority of historians believe that American intelligence knew the Japanese were going to attack somewhere, but didn’t know that the attack would be at Pearl Harbor; many in American military intelligence believed the Dutch East Indies would be the next target of the Japanese.

On Sunday morning, December 7, 1941, 190 Japanese warplanes attacked the American Pacific fleet anchored at Pearl Harbor. When the attack was done, 150 American airplanes were destroyed (most on them never left the ground), six battleships were sunk, as were a number of smaller ships, and nearly 2400 Americans were killed. Luckily for the American navy, the aircraft carriers based at Pearl Harbor were out at sea on the morning of the attack.

The next day Roosevelt asked Congress for a declaration of war, stating that December 7 was “a date which will live in infamy.” On December 11 Germany and Italy (who had signed a Tripartite Pact with Japan in 1940) declared war on the United States.

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