I wouldn't mind seeing a trade federation. Nothing big as a huge federal government like the old world US, or anything, only about the size of 3 old world US states at the most.
Different reigions with different resources or goods produced by skilled labor, the creme de le creme of each reigion chairing a seat in the federated government and establishing an economy and some form of protection for their citizens.
Maybe the majority of the federation is leaning one way or another disenfranchising some of its trade groups, perhaps on eof those sides is getting too big causing the smaller group to seek recourse.. Perhaps some old world resource stockpile or tech is found and a new player emerges and threatens to take over or change the structure of the federation?
I would like to see camp vouchers applied to at least one of the groups, in leiu of real money.
Not necessarily slavery, but unwitting indentured servitude. A "sold my soul to the company store" kind of thing.
I think it works for essentially seting up sperate factions over a large(er) reigion, with unique ways of life/customs/culture in each trade group, givign the player a sense of progress as they extablish ties with new locations..