One of the interesting things (rather cold statement) in the aftermath of Katrina is the unexpected (to me) profusion of extended families among the evacuees. Mostly black, but some white, although that's the proportion of media coverage, it seems lots of people have lots of siblings, cousins, uncles, aunts, who may evacuated together, got separated in the evacuation, or stayed behind to help relatives. It makes for a good story, a lot better than the individuals who were by themselves. Is this area of the South home to more extended families who seem to have been relatively immobile than other areas?
I've a hypothesis in mind--familial bonds are literally that--ties that can and do hold one back from individual achievement but supports that rescue one in times of peril.