This is drawn based on the writings of Robert Heinlein in I believe The Cat That Walks Through Walls or Friday. I thought the eastern section was divided north and south but perhaps not. I also thought that the west coast was divided in much the same manner of current red and blue zones.
I may be confusing Heinlein with the Postman that had a similar theme
However, the reality is not really regional because the progressive enemy is located in the cities. That is, there are presently de facto city states isolated within less urban majority of the territory. The last election teaches that the population concentrated within the city states exceeds all the rest