The document discusses the history of drought in Texas, noting that paleoclimatological evidence shows megadroughts have occurred in Texas lasting 20-40 years. It provides examples of droughts impacting Native Americans, Spanish explorers, early Texas settlers, the Civil War era, and throughout the 20th century. The most severe recent drought was in the 1950s, but the late 1980s drought was also particularly damaging, costing nearly $40 billion.