"They enjoy interacting with other blacks," Karyn Lacy, a sociologist at the University of Michigan, wrote in her book "Blue-Chip Black," for which she interviewed dozens of parents in Prince George's. "Scholars have focused so much on the burden of blackness that they have devoted scant attention to the possibility that there is something enjoyable about being black and participating in a community of blacks."Residential integration is not a goal, particularly for younger black professionals born after the civil rights struggles of the 1950s and 1960s, said Bart Landry, a sociologist at the University of Maryland who has returned to Prince George's for an update to his 1987 book, "The New Black Middle Class."He said many residents find comfort, after spending the day in a predominantly white workplace, returning to a home where all their neighbors are other professional African Americans. "They're where they want to be," Landry said. "They're not thinking about integration. It's not on their radar screen. . . . Their goal is to live in a community of like-minded, like-valued people, and these are other middle-class blacks."