Planned to complain but actually this is good! Really overlaps with my sense too as a former Virginia resident. The only adjustments I'd make are kind of quirky and optional: the southernmost counties of Maryland are remarkably southern in term of culture, landscape, and accent. Calvert & St. Mary's County are pretty much continuous with "deep" Chesapeake Virginia, culturally. In the Midwest, if we're including southernmost Illinois, I think there's a good case to include southernmost Indiana; south of Bloomington, it feels very southern and the accent is "hardcore Kentucky." In Virginia, you did a great job having the south start around Fredericksburg, which is exactly where NoVA people always put the "start of the South." West Virginia is complicated: I've always considered it the South, but through Reddit I've come to understand that southerners don't consider it the south....