Here are just some short historicall previews on SOME factions (i will add more).

Of course, if something cames out of this mod, some of this factions will be "civilised" (Inca, Chimu, Quito, Chachapoyas), some will be somewhat less (Mapuche, for example), and other will be similar to the barbarians from vannila, whith a low-tech tree, fewer units, etc.

Historicall acuracy is the first goal.