Geology Controls Everything

I was looking at the electoral map by county and I saw a familiar pattern. It's most obvious of the picture below that shows the counties that Republicans made gains in this election.


I know it's a little blurry but that's ok we're just looking at at VERY general trend. I've circled the area we're interested in. Now look at the geologic map of the United States. I've circled the same area.


See how the Mc Cain voting pattern ends as the rocks that make up the Appalachian mountains end? Here's a closer pic of the region.


Back in the good old days when dinosaurs roamed the Earth there was a giant inland sea called the Sundance Sea (or Western Interior Epicontinental Seaway for those of you who like the words). In the central Alabama Georgia region this sea lapped up against and weathered the rocks that make up the Appalachian mountains, depositing the younger (green) rocks. Geologically what we're dealing with here are older (Pennsylvanian, about say 300 millionish years old) rock of the Appalachian mountains truncated by and overlain by much younger (Cretaceous, about say 80 ish million years old) rock.
Geopolitically I'm sure there are a number of factors that play into why Appalachia is Republican country (and if there's a political scientist out there who would like to collaborate on something get in touch) my guess is that a lot of them are controlled by the underlying geology.
Interesting that on this map anyway the political boundary and the Geologic boundary coincide.