If you go to Georgia, ‘coke’ is whichever cola they have. At least that’s been my experience when visiting family down there. 99% of the time you get Coca Cola, but that 1% is a kick in the nuts.

Had the same experience when I lived in east Texas and visited rural Louisiana. But it wasn’t that way when I lived in Virginia. Coke meant Coca Cola, and if you asked for coke and they had Pepsi, they’d ask if Pepsi was ok.

In western Washington, it’s a hodgepodge.