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In page Internment of Japanese Americans:

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The surprise attack on Pearl Harbor on December 7, 1941, led military and political leaders to suspect that Imperial Japan was preparing a full-scale invasion of the United States West Coast.[6] Due to Japan's rapid military conquest of a large portion of Asia and the Pacific including a small portion of the U.S. West Coast (i.e., Aleutian Islands Campaign) between 1937 and 1942, some Americans feared that its military forces were unstoppable.[citation needed]