Here in the corn country midwest, we refer to canned soft drinks as “pop.” When we visit my sister in St.Louis, these same drinks are called “soda.” Discussions abound. It always ends with teasing about a Chicawgo accent.
Someone has taken the time to track and chart the names of generic soft drinks across the country. The results are interesting. Click the picture below to enlarge it and see for yourself.
There’s an interesting write-up about this colloquialism here.