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On December 17, 1941, the Japanese navy attacked Pearl Harbor, an American naval base in Hawai'i. This unexpected attack brought the United States into World War II. On February 19, 1942, Executive Order 9066, issued by President Franklin D. Roosevelt, gave the American military broad powers to remove individuals from any areas deemed necessary for security and military purposes. Designated military zones were established in western California, Oregon, Washington, and southern Arizona. On March 18, Executive Order 9102 created the War Relocation Authority (WRA) to supervise the evacuated population. Milton Eisenhower (brother of General Dwight Eisenhower) was appointed to direct it. Although most people affected by the order were of Japanese ancestry, smaller numbers of persons of Italian or German heritage were also interned by authority of its powers.

Executive Order 9066 was issued as a precautionary measure, in response to security concerns based on large numbers of persons of Japanese descent living in Hawai'i and the West Coast. Identifying and removing persons of Japanese ancestry was aided by the Second War Powers Act of 1942, which suspended the prohibition against revealing personal data collected by the U.S. Census. (The prohibition was restored in 1947.) As a result, records from the U.S. Department of Commerce show that the Census Bureau released information about the names and locations of persons of Japanese ancestry living in Washington, D.C., and block-level data were also used in several states to identify neighborhoods in which persons of Japanese ancestry were living.

Forced Evacuations

The War Department was charged with removing people of Japanese descent from the military zones. A voluntary removal programs was tried at first, but only about 5,000 Japanese people responded. The first forced evacuations took place in February 1942 at Terminal Island, near Los Angeles Harbor, and in March on Bainbridge Island, in Puget Sound, Washington. Large-scale evacuations began later that month. Over 90,000 evacuees (about 70 percent of whom were American citizens) were brought to one of 16 assembly centers located in California, Oregon, Washington, and Arizona.

Most evacuees had only a few weeks to sell their homes and personal property and get their finances in order. Assembly centers were hastily prepared and often located in inhospitable areas. For instance, one camp in California's Owens Valley recorded temperatures of over 110 degrees in the summer.

Most evacuees stayed at the assembly centers for one to four months before being moved to more permanent relocation centers. Ten relocation centers were established in isolated regions of Utah, Arizona, Arkansas, Colorado, Wyoming, Idaho, and California, and were constructed on the model of military barracks. Each family was allotted one room, no matter how many people were in the family. Bathing and toilet facilities were communal, and meals were served in communal mess halls. Although it originally had been thought that residents of these centers could work in agriculture, many locations were unsuitable for this purpose, including Manzanar, California; and Gila River, Arizona; which were located in deserts, and Jerome and Rohwer, Arkansas, located in swamp areas. Ultimately, the War Relocation Authority interned over 120,000 people during World War II.

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