From the record
“Crystal City Internment Camp, located near Crystal City, Texas, was a place of confinement for people of Japanese, German, and Italian descent during World War II, and has been variously described as a detention facility or a concentration camp. The camp, which was originally designed to hold 3,500 people, opened in December 1943 and was officially closed on February 11, 1948.”
Wikipedia article Crystal City Internment Camp, CC BY-SA 4.0.
One of 2 National Register listings published here for Zavala County · listed in 2014 · category: Site.
Sources: the Wikipedia article · the National Register database, National Park Service