https://en.wikipedia.org/wiki/Rhoticity_in_English, a friend of mine was a linguistics major and loved talking about it. I also learned a nonstandard dialect is why my “coil” sounds like col. There was a NY times quiz that tried to figure out where you were from based on some word and pronunciation questions, I wonder if theres a similar one for Canada.

The Big Dark Sky by Dean Koontz, Black River Orchard by Chuck Wendig, and Snow Crash by Neal Stephenson