English: Japanese Americans arrive for Internment processing, from San Pedro at the Pacific Electric Railway (Red Cars) station, in Arcadia, Southern California, during WWII. Internment was a response to the suspicions that the Japanese government may have planted spies and propagandists, or terrorist cells, in the United States population after the bombing of Pearl Harbor. These suspicions were largely unfounded, and may have caused a sort of anti-Japanese sentiment to develop toward ordinary Japanese-Americans.

• Processing occurred at the Santa Anita Assembly Center in the Santa Anita Park Racetrack facilities, from March to October 1942, to receive assignments to remote inland Internment Camps.
• Those awaiting processing here lived in hastily constructed barracks and in existing stables, with 8,500 in converted horse stalls.
• U.S. NPS: Santa Anita Assembly Center (webpage).