The Poston Internment Camp, located in Yuma County in southwestern Arizona, was the largest of the ten American concentration camps operated by the War Relocation Authority during World War II.
The site was composed of three separate camps arranged in a chain from north to south at a distance of three miles from each other. Internees named the camps Roasten, Toastin, and Dustin, based on their desert locations. The Colorado River was approximately 3 miles to the west, outside of the camp perimeter.
Poston was built on the Colorado River Indian Reservation, over the objections of the Tribal Council, who refused to be a part of doing to others what had been done to their tribe. However, Army commanders and officials of the Bureau of Indian Affairs overruled the Council, seeing the opportunity to improve infrastructure and agricultural development on the War Department budget and with thousands of "volunteers."
The combined peak population of the Poston camps was over 17,000, mostly from Southern California. At the time Poston was the third largest "city" in Arizona. It was built by Del Webb, who would later become famous building Sun City, Arizona and other retirement communities.