Arizona, and all of California as Exclusion Zones on March 2, 1942. Four days later, the executive order informally extended to Alaska, covering the entire West Coast of the United States. It defined Japanese Americans, Italian Americans and German Americans as peoples to be excluded from these areas. Soon after the War Department initiated the removal of over 110,000 Japanese Americans from these areas, forcing them into temporary "assembly centers" run by the Wartime Civil Control Administration. Typically, these centers were hastily converted large public spaces, such as fairgrounds and horse racing tracks, while construction on Heart Mountain and the other more permanent "relocation centers" were completed. Building Heart Mountain On May 23, 1942, the War Department announced that one of the camps for displaced Japanese Americans would be located in Wyoming, and several communities, hoping to capitalize on internee labor for irrigation and land development projects, vied for the site. Heart Mountain was chosen because it was remote yet convenient, isolated from the nearest towns but close to fresh water and adjacent to a railroad spur and depot where Japanese Americans, as well as food and supplies, could be off-loaded. On June 1, 1942, the Bureau of Reclamation transferred of the Heart Mountain Irrigation Project and several CCC buildings to the War Relocation Authority, the branch of the Western Defense Command responsible for administration of the incarceration program. More than 2,000 laborers, including men employed by the Harza Engineering Company of Chicago and the Hamilton Bridge Company of Kansas City, began work on June 8, under the direction of the Army Corps of Engineers. The workers enclosed of arid buffalo grass and sagebrush with a high barbed wire fence and nine guard towers. Within this perimeter, 650 military-style barracks were laid out in a street grid, with administrative, hospital, educational, and utility facilities, and 468 residential dormitories to house the internees. All of the buildings were electrified, which was at the time a rarity in Wyoming, but due to time constraints and a largely unskilled workforce, the majority of these "buildings" were poorly constructed. Army higher-ups gave the site's chief engineer only sixty days to complete the project, and newspaper ads recruiting laborers promised jobs "if you can drive a nail" while workers boasted that it took them only 58 minutes to build an apartment barracks. Thousands of acres of surrounding land were designated for agricultural purposes, as the