A recent ex-singer for my current band hailed from Wisconsin, and while hard to describe, he also had a very distinct twang to specific words and phrases. My least favorite US accents would have to be Baltimore and Boston. John Waters worked wonders for the former, probably to the chagrin of all of Maryland, lol.

Yeah, there's a wealth of unique accents across our great land(s). US variations are more noticeable to us, I suspect, while many of the British variables sound very similar to our untrained Yank ears (although over the years, I have a better discernment for many GBR regions, just not so acutely as it is to their ears.)