Growing up in Ohio, it was called “pop” and no one disputed this. Later I was exposed to friends and relatives from the east who called it “soda.” Now I live in the South and it’s “coke.” Where do you draw the lines between these words for the same thing?
There’s a cool interactive website here, and they have a nice detailed map here.
Ohio and a good bit of the midwest own “pop” but I find the “soda” enclaves of St. Louis and Milwaukee interesting. I guess “soda” is more of the sophisticated big city term.
I’ll stick with “pop.”