I've always called it pop, but my husband calls it soda, and we didn't grow up too far away from each other. At least I know when I see 'soda' on the grocery list, it means to pick up his flavor of pop.
Saying pop makes people sound like either an idiot or a 2 year old. This is the only area in the country where soda is called pop and it makes us look so stupid.
According to the "map" linked above you are wrong. The "pop" belt extends from western Pennsylvania to the northwest coast. The south is "Coke" and the Northeast, St Louis area and the southwest including Cali are the "soda" areas.
Being from the Chicago area, I know that it originated around Chicago from the "Hutchinson Stopper." A device used to close a bottle which contained soda. Once the stopper was opened, it created a popping sound. Take a look at the article below. Scroll down to "Soda Pop"
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