Certainly Washington, D.C., is at the center of a rapidly growing metropolitan area. But the Nation’s Capital is itself a relatively small city. Just 680,000 live within the heart of the Beltway, of whom approximately 320,000 are Black and 280,000 are White. Or, to be clearer, it is two cities, one White and increasingly prosperous, the other Black. Black Washington is not in any meaningful way in the same socio-economic category as White Washington, and that is clear by every…