Ever heard of the Great Recession of 2008? Did you miss all the news of auto manufacturers and suppliers based in Detroit closing up shop and either moving elsewhere or shutting down altogether? You do know Detroit is called "the Motor City," right? As in, automotive manufacturing. What, pray tell, do you think will happen to ANY town that loses its bread and butter industry? You racists try reach so hard it's plain ridiculous.
Have you heard of the great migration of the 20th Century? They shit out more than just Detroit.
http://en.wikipedia.org/wiki/Great_Migration_(African_American)
New Orleans, Baltimore, D.C., St. Louis to name a few more. Right, wrong or indifferent American cities with more than 50% black populations are typically enormous shit holes.