Those counties which lie just inside what would have been the shoreline of the North American continent during the Cretaceous period voted overwhelmingly for Obama.
Why? According to a comment by "Neal", the areas which were once prairieland during the Cretaceous. These areas ended up over time with a soil that was just right for growing cotton. American plantations sprang up in these places, today those areas remain populated by African American descendants of the slaves who worked on the plantations. And African Americans voted predominantly for Obama, while their southern white neighbors went for McCain. Fascinating stuff.
More discussion at strange maps, virgorous north
Cretaceous map by Dr. Ron Blakey
Cotton map by Strange maps blog
Electoral county map by Mark Newman
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