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North American English Dialects, Based on Pronunciation Patterns
(files.catbox.moe)
For the map enthused!
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Interesting how Washington, DC used to be within the Southern accent territory, but this has died out to mostly older speakers.
The anecdote that really hits this home for me is that in 2006 they updated the voice on the metro which said "Doors closing, please stand clear of the doors." The old voice had a southern accent but the new voice did not.