Following the attack on Pearl Harbor, the United States declared war on Japan on December 8, 1941. On February 19, 1942, the President issued Executive Order No. 9066 authorizing military commanders to prescribe military areas from which any or all persons could be excluded. Lieutenant General DeWitt, commander of the Western Defense Command, issued Public Proclamation No. 1 on March 2, 1942, establishing Military Areas Nos. 1 and 2 covering the Pacific Coast states and portions of Arizona. On March 21, 1942, Congress enacted legislation making it a misdemeanor for any person to enter, remain in, leave, or commit any act in a military area contrary to restrictions imposed by military order.
On March 27, 1942, General DeWitt issued Proclamation No. 4 prohibiting all persons of Japanese ancestry within Military Area No. 1 from leaving the area until further order. On May 3, 1942, he issued Civilian Exclusion Order No. 34, which required all persons of Japanese ancestry to depart from a described portion of Military Area No. 1, including San Leandro, California, by May 9, 1942, and to report to assembly centers for instructions. Fred Korematsu, a native-born United States citizen of Japanese ancestry residing in San Leandro, remained in the prohibited area after the deadline.
Korematsu was charged by information in federal district court with violating the March 21, 1942 Act by knowingly remaining in the area covered by Exclusion Order No. 34. He was tried under a plea of not guilty, convicted, and placed on probation for five years. The Circuit Court of Appeals affirmed the conviction, and the Supreme Court granted certiorari because of the importance of the constitutional question presented.
At the time of the charged violation on May 30, 1942, Korematsu was subject to an earlier order prohibiting him from leaving Military Area No. 1 and the later exclusion order requiring him to leave unless he reported to an assembly center. No question was raised at trial concerning his loyalty to the United States, and the sole basis for the conviction was his Japanese ancestry and presence in the area after the exclusion date.
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