A relatively fun quick read. Who doesn't like the idea of zombies in the Reconstruction era? Except there is no reconstruction to be had in this story, since the zombies rose after Gettysburg and the hostilities ceased to deal with that threat. Decades later, it's still not over but now the US is divided between Egalitarians and Survivalists. The main protagonists are two black girls sent to combat schools since the role of blacks is to now protect whites from the zombies.
As I said, a fun read but man, I wished more contemporary expressions had been fixed at editing. It's a pet peeve of mine. If you're going to write about a given historical period, clean up the language.