During World War II, trains delivered thousands of civilians from the United States and Latin America to Crystal City, Texas. The trains carried Japanese, German, and Italian immigrants and their American-born children. The only family internment camp during the war, Crystal City was the center of a government prisoner exchange program called “quiet passage.” Hundreds of prisoners in Crystal City were exchanged for other more ostensibly important Americans—diplomats, businessmen, soldiers, and missionaries—behind enemy lines in Japan and Germany.
Jan Jarboe Russell writes about Crystal City in her book, The Train to Crystal City: FDR's Secret Prisoner Exchange Program and America's Only Family Internment Camp During World War II, now out in paperback.