West South Central states
The West South Central states, colloquially known as the South Central states, is a region of the United States defined by the U.S. Census Bureau as covering four states: Arkansas, Louisiana, Oklahoma, and Texas. The West South Central or South Central region is located within the Southern United States and Gulf Coast regions, bordering the Mountain states and Midwestern U.S. regions to its north and west.
Source: Wikipedia — West South Central states (CC BY-SA 4.0)