General Outline (I will be working on this next week because I am busy you fuckers):
Latinic civilization in the northeast. Big, brings writing over to vallos which spreads to Sarpic city states. Sarpic city states and Latinic colonies feud, with sarpic power concentrating in west. Eventually Loa come, and setting setting south. The Latinics and Loa help crush the sarps, then the Latinics slowly collapse and then Loa warlords supplant latinic authority. Eventually Early Loa Empire (Kingdom of Mi'isima) which stretches from modern day Takatta Loa to just north of big central lake and north part of Eastern blank space. This is where prehistory leaves off.
Religion; Latinic religion, maybe with some derivations. Sarpic well worship gets coopted into Loa faith, which is polytheistic at this point revering Maouana, Queen of Heaven and Ancestral mother of the Loa. Temples, idols, sacred wells abound in this pre aniconic time. Also, no bug cults yet.