The United States was the starting point of the Psi Plague. It was never determined where the plague came from. It could have been from foreign terrorists, it could have been from domestic experiments gone wrong.
Survivalists and cabins in remote areas. This ironically spread the plague to rural areas faster than expected. It also lead to more clashes between armed civilians and military troops. Often groups would end up taking over a rural area and setting themselves up as the rulers. Long live monarchy and feudalism.
Retreats can range from basic camps with some weapons to elaborate compounds. Large compounds will look like a fort with fields of fire, defenses, etc. They'll have planes for scouting, fuel and ways to rebuild their basic infrastructure. groups can decide to emulate various time periods including dress, speech and such. The spur to this could be availiable tech giving the area an idea. Maybe a re-enactment group survives because they have low tech stuff that keeps working.
Period groups:
bandits. mobs fleeing cities by car, boat, etc.
"squirrels" - people left behind in the city that try and survive. not many left since society has tried to move back to cities.
small towns might survive, but also likely to fall below critical mass if many people die. With 40% base fatalities, there may not be enough to keep coma stage people alive at all. This could boost the fatality rate to 90% even.
Military bases become center points for new feudalism. Already have hierarchy, guns, etc.
all the tinderbox areas of world go up in flame. final battles in Israel, Africa, etc with nobody left to stop it. Last Man Standing Wins. Thirty Years War of limited armies but some fast communications. balkanization of US and whole world
types of gangs - single charismatic leader. street gangs turned raiders or extortionists. Mafia types. biker and car gangs.
religioius fanatics and cults
"national" reunification authority - long running battles with local troops to bring US back together. could be good or evil.
scavanging. both urban and suburban.
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