The Museum of South Texas History in Edinburg, Texas, preserves and interprets the history of the Rio Grande Valley, South Texas, and neighboring northeastern Mexican states. Opened in 1970 as the Hidalgo County Historical Museum in the county’s 1910 Old Jail, it grew into a regional center occupying three buildings on the town square. Its exhibits span from prehistory through the 20th century, including prehistoric animals, Coahuiltecan Indians, Spanish colonization, the Mexican-American War, the U.S. Civil War, the steamboat era, the cattle kingdom, the Citrus Era, and the Mexican Revolution. Its archives also hold the Rio Grande Valley’s largest collection of historical photographs, documents, and maps.