People talk about the low information crowd, those on food stamps, welfare, and such. The way I look at it, most of those people are too lazy or inept to make it on their own and need - desperately - someone to take care of them.
Than there are those who do know how to survive when the shinola hits the fan. I firmly believe these types live more in the outer suburbs to the country.
Those who need someone to look after them will gravitate to those who they think will take care of them. In the urban areas of the cities, the thugs and gangsters will take charge and use these people as cannon fodder. In the outlying areas, those who have the knowledge and skills to survive can afford to pick and choose.
The survivors can pick those who can work - the able-bodied and so on. They will teach these people to survive, to hunt, fish, shoot, cook, fix things, mend, trap, track, ambush, kill, etc. They will discard the less able-bodied - send them back or kill them outright. If you can't work, you can't live here. Also, they will teach people what made the country worked in the first place - hard work, Christian beliefs, charity.
The gangsters will hold up in the cities and meagerly exist. They will at times make excursions into the country for supplies and people - slaves. But they will fail because they will not have the knowledge - or tactical knowledge - in how to fight and win.
Just thoughts off the top of my head.
I always go back to one of my favorite shows of all time, Connections, and this scenario....I remember watching this back in the early 80s and it really was sobering to comtemplate, and that trap is now even tighter than ever.
https://www.youtube.com/watch?v=lKELMR6wACw