https://en.wikipedia.org/wiki/Federal_Emergency_Management_A...
"The agency's primary purpose is to coordinate the response to a disaster that has occurred in the United States and that overwhelms the resources of local and state authorities."
"The agency's primary purpose is to coordinate the response to a disaster that has occurred in the United States and that overwhelms the resources of local and state authorities."
I don't think any state is going to wind up having had a stockpile sufficient for this sort of prolonged, world-affecting disaster.