What? I see no such thing in the Philly-to-DC cities and suburbs. Maryland is very mixed, two counties deep outside the large cities. And since 2008, there has been a concerted effort to shoehorn Section 8's into all areas, including HOA and gated communities.
You’re right about the Section 8 housing, which is used as a means to fund welfarians (as their cities are bankrupt) - but once they appear in a neighborhood in any numbers (where a racial attack is even a possibility), the whites leave. Our black populations live closest to the Hispanics and Asians trafficked here to fill those voids created.
I’m not aware that Philly has integrated neighborhoods, and never considered Marylanders “Yankees” - not out of snootiness, but because I’d think they find it offensive. Maryland wasn’t just a slave state during the Civil War (which another FReeper described as “flooded with Union troops by Abraham Lincoln to prevent them from joining the Confederacy”), but it is south of the Mason-Dixon line.