New Orleans / Katrina. A *lot* of them have never gone back.

Houston absorbed several tens of thousands of refugees from that and makes a good study, in the small, for the problems that can come up, though you have to allow for the huge medical complex in Houston in comparisons.

Ironically the worst may have been the affect via "No Child Left Behind" - the New Orleans schools were so bad that the refugees managed to drag down the *Houston ISD* scores to the point of losing school funding via penalties. The waivers should have expired by now but I don't know what happened.