Soda vs. Pop

In my web surfing today I found an interesting website that put the carbonated beverage naming convention in a pretty color chart. It's called Generic Names of Soft Drinks by County.

As you can tell it's pretty concentrated in some areas and in others, I am surprised the next war of northern aggression hasn't broken out. It could get pretty heated while I was in college, which if you will notice Rochester, NY is located on the border of the blue and the yellow.

This was my argument, you call it a soda fountain and you get soda out of it, therefore it's soda. My logic is completely flawless. See how that works? Pretty nifty if you ask me. So what do you call it?