The Post Sickness World of Phoenicia
In the former United States, after a biological weapon has wiped out most of humanity, a new nation has arisen, founded on the principle that Phoenicians will always be the toughest SOBs around, so that others will think twice about messing with them.
The foundation is laid in 'Getting By' when Gavin Thompson recovers from the sickness and determines not to let civilization slip away.
Other stories are set outside Phoenicia, but in the same universe.