Who are all the tribespeople and how are they alive? Are they just normal descendants of humanity before the incident or are they from ELEUTHIA?
Well sometime after the 'end', Gaia did successfully make a working Earth and they began to pump out humans out of the cradle facilites. However with the loss of APOLLO, a lot of that information they were supposed to be taught was lost and so they had limited teachings from Gaia's robo human people. Eventually, however, the facilites were running low on food and such and the robo humans basically said they had to let the kids (now adults) out.
The tribes we know now are those humans who left the cradle facilites.