How did the poor response to the Hurricane Katrina disaster change emergency management in the United States?

Review the following article and video:

Ragheb, M. (2016). Natural Disasters and Man-Made Accidents. Retrieved from: http://mragheb.com/NPRE%20457%20CSE%20462%20Safety%20Analysis%20of%20Nuclear%20Reactor%20Systems/Natural%20Disasters%20and%20Man%20made%20Accidents.pdf

Can you think of any positive or negative aspects of disaster-driven evolutionary changes in the United States’ emergency management system? What are they?
How did the poor response to the Hurricane Katrina disaster change emergency management in the United States?