Wow thanks! I did some quick googling and it seems there is something to it historically. Though how much of a role (if any) racial division currently plays as opposed to economic and other political motivation is unclear. I'm not inclined to read heavily politicized novels by a single author, typically they're too partisan and don't present things without bias, but I am open to learning more from less bias sources and it does seem that at least in DC's earlier years it as a factor.
I don't know if you googled Dream City and came up with something else, but it's not a novel. It's a nonfiction history book written by two DC journalists.