Western theater of the American Civil War
The western theater of the American Civil War encompassed major military operations in the states of Alabama, Georgia, Florida, Mississippi, North Carolina, Kentucky, South Carolina and Tennessee, as well as Louisiana east of the Mississippi River. Operations on the coasts of these states, except for Mobile Bay, are considered part of the lower seaboard theater.
Source: Wikipedia — Western theater of the American Civil War (CC BY-SA 4.0)