What did rise from the Hurricane Katrina?

I think the fast reason why the disaster led bigger damages is the gap between rich and poor people in the state. I had not known the fact that two of three people in New Orleans are black, and that they are quite poor as they cannot afford to buy a car to get out of the region. If they have ways to escape or if they have places to go, they must have leave as fast as they could. What all the American, or even people in other countries, have to perceive from the tragedy is there are a lot of hidden poverty on the glob.