This link was tweeted by J.A. Adande, which is how I came to read it.
http://www.theatlantic.com/features/...on-now/359813/
The article is really long, but completely fascinating to me.
TLDR version: Some southern cities have redistricted their cities so that essentially blacks and whites are in separate schools again. Black school are getting less funding and worse teachers, including teachers fired from other districts. Predictably, test scores are dropping.