The Pop vs. Soda Page

I say 'Soda,' Lisa says 'Soda,' but was raised saying 'Pop' and her family all say 'Pop' but apparently I was wrong in my thought that these were the only two variables out there and St. Louis was the only place in the world where folks said 'Soda' (or the ever-popular 'So-dee' - whatever the heck that is).