http://imgur.com/JrLzd8X
http://images.sciencedaily.com/2014/09/140909162349-large.jp...
Green = African American, Orange = Caucasian
FWIW, having moved from the St. Louis area and traveling through Ferguson MO on a daily basis, it's obvious to me the racial makeup is a symptom/result of economics. Race + economics is a hard ship to steer, for sure.
Or it's a really easy ship to steer, and racial makeup is a symptom/result of preferences, planning, legislation, and enforcement.
http://imgur.com/JrLzd8X