what kind of accent and vocabulary did people from Delaware have around the American Revolution?

Answer 1

The main dialect of colonial Delaware was rooted in Quaker migrations (1675-1725) from the Midlands area of England (near Wales), though the southern part of the state would be influenced by the Chesapeake dialect of Marylanders.

For more on this dialect (accent and vocabulary) see the discussion of the four great colonial migrations at::
http://pandora.cii.wwu.edu/vajda/ling201/test3materials/AmericanDialects.htm

David Hackett Fischer's book *Albion's Seed* goes further into these four groups, examining ALL their "folkways".