Pop, of course. The dividing line goes through Pennsylvania. It’s what makes Philly east coast, while Pittsburgh is more midwestern.
I hate to tell you this, SD, but Cyber who is originally from Michigan calls it “pop.” I thought he meant Popcycles. I drink “soda,” as in Diet Coke in the morning and Ginger Ale in the evening.
I still think so many things are east or west of the Mississippi.