I'm originally from Prince George's County.
20 years ago there were White areas of the county and Black areas of the county. White areas like Bowie were very Republican, and the Black areas like Suitland were just extensions of DC. Today, I think, the county is much more integrated, and the White suburbanites are much less Republican.
Probably the same situation is going on the Montgomery and Baltimore counties. Combined with the continued growth of the urban sprawl, this state is going to continue trending Democrat.
There aren't many White-majority precincts left in PG's.
