RC Cola was the first soda that could be bought in a can, the first soda customers could find in a 16-ounce package, and the first company to offer diet soda. RC may not be as prominent as Coca-Cola today, but the soda is still well-loved in the South.
https://deepsouthmag.com/2022/04/11/rc-cola-and-a-moonpie-the-working-mans-lunch/