http://www.washingtonpost.com/wp-srv/special/nation/census/2010/Check out this cool demographic map of the US. One thing that stood out concerning this region is that there is a precinct in Shelby County that is 95% black sitting right next to a precinct in DeSoto across the state line that's 80% white! Almost the entire southern border of Shelby is like that- majority black precincts in Memphis bordering majority white precincts in Mississippi just a few feet away. It's similar to 8 Mile Road in Detroit. You don't see that very often anymore.
