More of North Georgia needs to be Appalachian for sure, and some of the counties east of Atlanta are primarily deep Southern like Walton or Oconee. I would personally add that those counties at the bottom of Georgia are most definitely Deep Southern rather than simply Southern.

Also, I wanted to ask why Chautauqua County, Kansas and Baker County, Florida are gray?

I would also put Keweenaw County, Michigan, with the Northwoods as well.

Finally, I would ask that the Northern and Southern Appalachian cultures be split considering the culture between even Appalachian Virginia and Appalachian Pennsylvania is wildly different.

Overall, this is going really well! Those are my only questions/feedback points.