In reply to:

Yes, we can perceive that variety quite clearly, but only to the large general regions you just specified. Tight regional speciation like the kind you described for Liverpool/Manchester/etc is only something that experts can discern.



My cousins who live an hour away in baton rouge have an accent. And my cousins in Alabama have a huge accent, but they've only lived there a few years and never had it before. And there's something about the way people from Colorado talk.