I don't think it's meaningful to say the two groups "live in separated regions". I live in the capital of NY, and when I hit the road to go on vacation a week ago, the first pickup truck I saw with a Confederate flag was less than 30 minutes outside of town. Thinking of things in terms of "red" and "blue" states can lead you to an incorrect way of looking at things. At a more granular level, the country is all red over most of the land area, with blue clusters and tendrils around population centers, like neurons. Both "red" and "blue" states look like this.