Tyler Cowen has a post on that theme at Bloomberg.
An anecdote: a relative recently attended the high school graduation of a grandson in North Andover, MA. She commented to me she was surprised by how diverse the area had become (she was a girl in Andover during the 1940's). I looked up on wikipedia and found North Andover was, in 2010, about 6 percent minority. Currently the school's site says 18+ percent are minority.
According to Cowen Charlottesville is 9 percent minority. Fairfax county is about 50 percent.
I'm the sort of soft-headed bleeding heart liberal who enjoys this.