Tangier Island in Chesapeake bay was settled by emigrants from Cornwall in SW England in the 17th Century and the Cornish accent has survived to a certain degree to this day.
You might not want to view the entire video, but have a listen from 13.00m to Dorsey Crockett...
And then compare with the Cornish accent as spoken today...
To my ear, Mr Crockett's accent has more in common with the Eastern coastal counties of Norfolk and Suffolk than with Cornwall, but after three or four centuries they have probably diverged somewhat.
Of course, it's entirely possible that Mr Crockett's accent is the genuine and original article!
__________________
|