This has been provoking much discussion today. It's a Brookings Institution report on the "re-emergence" of concentrated poverty in America. In the video, Alan Berube lays it out in brief and makes one very interesting — and alarming — marco point: In the cities of the Midwest, "the recession that started at the beginning of the decade never really ended."
The coasts have fared better. However, Berube also observes that concentrated poverty isn't just an urban phenonomeon any longer; it's moved into the suburbs. We've seen this in California. The UCLA Anderson Forecast that came out earlier this year indicated that the state is separating into two distinct regions or zones: the coast, where unemployment is moderating and growth is resuming; and the inland areas, where economic stagnation is setting in.