Interesting question. I just got copied on an e-mail that provides a long list of ways to know for sure if someone is from Chicago. One is that carbonated beverages are called "pop."
In our house it's soda. However, the term "soda pop" does have its place as well. I recall advising an oenophile relative how much I disliked white zinfandel and he emphatically agreed and advised that it was like "soda pop" and that term did seem to imply "sweet" better than just "soda" would have. He's originally from New Orleans. I don't know what they call it there, but I suspect soda/pop is kind of an incidental beverage in those parts anyway.
In our house it's soda. However, the term "soda pop" does have its place as well. I recall advising an oenophile relative how much I disliked white zinfandel and he emphatically agreed and advised that it was like "soda pop" and that term did seem to imply "sweet" better than just "soda" would have. He's originally from New Orleans. I don't know what they call it there, but I suspect soda/pop is kind of an incidental beverage in those parts anyway.