http://graphics.wsj.com/baltimore-demographics/ http://www.baltimoresun.com/news/data/bal-baltimore-segregat... http://www.huffingtonpost.com/2015/04/28/baltimore-segregate...
It's very easy and very comforting to say that maps like the ones you linked are just a result of white people not wanting to live around black people, because white people are racist. I get that. Who wouldn't rather believe a just-so story than acknowledge that not everything is simple and not every problem has an easy solution? Just don't make the mistake of confusing a just-so story with reality, or imagining that by doing so you're very likely to be of benefit to anyone.
Likely due to net-population-availability of minority groups, and I won't disagree that many neighborhoods are almost entirely black (stayed with a friend living off diamond st one time), but I will say that one shouldn't then draw that to mean everyone in those cities also lives along the lines of such segregation. (To try and explain why the parent, and myself, had an experience that didn't always align intuitively with those articles)
What I'd also call out though that I wouldn't have noticed outside of having grown up there, is that I'd draw the lines there FAR more aggressively along socioeconomic boundaries, which just so happen to correlate with race. Not even starting to turn this into a discussion about which direction the correlation moves in, but I'm always hesitant to paint it soley it as a racial problem.
Baltimore here, almost two decades. If the point you're using my city to make were as obvious as you make it sound, I would not now need to ask that you make it explicit.