THE CHANGING FACE OF AMERICA - Part 2: Prince George's County Writer Leon Wynter, author of the forthcoming book: Dreaming in Color: The Business of Browning America takes us on a tour of present-day Prince George's County, Maryland. On the eastern flank of the nation's capital, it has become the largest black majority suburban county in the US. And it's more wealthy than it was 20 years ago when Wynter was there as a cub reporter and the county was mostly white. Migration by upper middle-class blacks from The District of Columbia contributed to the rise in income. But the county has an underdog image. Race is a factor, think some county leaders. No major upscale malls are located there although income levels would support them. A new dilemma and cause for African-Americans.