I had a university prof who grew up in one of the Dakotas, and the use of “Coke” to refer to any soft drink prevailed there as well.
One of my U buddies called drinking fountains “bubblers” which was (he said) the practice in Wisconsin, and was a strong advocate of saying “soda” instead of “pop”.
Meanwhile, there’s still cancer to cure...
I’ve always called them ‘cokes’ no matter the brand............
I thought THG had done something with this, but noticed nothing.
https://www.youtube.com/@TheHistoryGuyChannel/videos
https://www.youtube.com/@TheHistoryGuyChannel/search?query=soda