I wasn't sure where to post this -- but it's a really fascinating survey of regional (U.S.) differences in pronunciation and word usage:
http://www4.uwm.edu/FLL/linguistics/dialect/maps.html
Wow, loved this post, thanks for that!

I'd like to see a study mapping the convergence of accents over time, globally.. to see if that's actually happening or not.
Very interesting indeed!
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Thanks! A lot to learn.