South Carolina - Blenheim Ginger Ale
Since 1903, Blenheim has been producing some of the country's finest ginger ales in Hamer, South Carolina -- in mild, hot, and diet varieties.
South Dakota - Coca-Cola
The Dakotas have really got to ramp up their soda game, because South Dakota, too, was impossible to find any soda for. Pretty safe to say they like Coke there, though.
Tennessee - RC Cola
Famous in the South due to its status as one half of a working man's lunch (the other being a Moon Pie), RC Cola's made in Georgia, but it's pretty beloved in Tennessee, as well.
Texas - Dr. Pepper
If you ask a Texan what kind of Coke they want, chances are their answer will be "Dr. Pepper." (Sorry, Big Red.) Granted, "Coke" is their word for soda, but it's still pretty telling.