[quote=@Byrd Man]
I'll go ahead and bow out. I can't pick a location, let alone a solid idea to accompany it. Didn't mean to be a tease.
[/quote]

For South Carolina?

Take the neo-confederate idea and turn it on its head. Have people who haven't retained much information about the confederacy but rather worships their flag in a sort of weird folk religion where Lee is a savior and Sherman a devil-like boogie man. Otherwise they reject all historical accounts as blasphemy and insist in a theological interpretation of the pertinent information.

Other idea that people might bring up for the rest of the world include ones I think I have mentioned before but i'll list them again if anybody needs a prompt.

-A Muslim state at Guantanamo founded by the prior inmates. 
-A Jewish state in Florida started by retirees and the children who were visiting at the time.
-A cattle-based nomadic state in Los Llanos in Venezuela. Think "Rawhide" meets "Genghis Khan", but with [url=https://en.wikipedia.org/wiki/Llanero]Llaneros.[/url] It's just barely on the map, but you could push them up a bit.
-A only partially flooded Houston Texas is on the map. You could use them to reference the condition of Texas. Other interesting towns technically on this map include Vicksburg Mississippi, Jackson Mississippi, Montgomery Alabama, and Savannah Georgia. I can especially imagine a situation where the violence of the apocalypse puts Vicksburg back on the Mississippi and turns it into an important fort holding back scary barbarism from up river.
-It looks like Cancun is an island now. Government via Spring Break. Might be able to negotiate a spring-break city state from Shorticus. 
-The Bahamas are ghost islands that only appear at low tide. Imagine them as a place where criminals from other nations are banished to, and forced to live a harsh life where they must sleep on rusty boats and scrape a sea-food based living on the shitty scraps of ground.
-The Panama Canal exists. Do something with that.

I also noticed the map only covers part of the Caribbean. Why no Puerto Rico? Why no lesser Antilles? I was going to say 'The American Government fled to Puerto Rico" but can't do it because it missing.