The Tanforan Assembly Center was created to temporarily detain nearly 8,000 Japanese Americans, mostly from the San Francisco Bay Area, under the auspices of Executive Order 9066. After the order was signed in February 1942, the Wartime Civil Control Administration acquired Tanforan Racetrack on April 4 for use as a temporary assembly center; plans called for the site to be used to accommodate up to 10,000 "evacuees" while permanent relocation sites were being prepared further inland. The Tanforan Assembly Center began operation in late April 1942, the first stop for thousands who were forced to relocate and undergo internment during World War II. The majority were U.S. citizens of Japanese ancestry who were born in the United States. Tanforan Assembly Center was operated for slightly less than six months; most detainees at Tanforan were transferred to the Topaz War Relocation Center in Utah, starting in September. The transfer to Topaz was completed by mid-October, and the site was turned over to the Army a few weeks later.

Chiura Obata was a well-known Japanese-American artist and popular art teacher. A self-described "roughneck", Obata went to the United States in 1903, at age 17. After initially working as an illustrator and commercial decorator, he had a successful career as a painter, following a 1927 summer spent in the Sierra Nevada, and was a faculty member in the Art Department at the University of California, Berkeley, from 1932 to 1954, interrupted by World War II, when he spent a year in an internment camp. He nevertheless emerged as a leading figure in the Northern California art scene and as an influential educator, teaching at the University of California, Berkeley, for nearly twenty years and acting as founding director of the art school at the Topaz internment camp. After his retirement, he continued to paint and to lead group tours to Japan to see gardens and art.