Some examples in the book include the Wendat people and Teotihuacan. You can also check out the book’s wiki page https://en.wikipedia.org/wiki/The_Dawn_of_Everything.

One of the core conclusions of the book that you may find interesting (quote from the wiki):

Based on their accumulated discussions, the authors conclude by proposing a reframing of the central questions of human history. Instead of the origins of inequality, they suggest that our central dilemma is the question of how modern societies have lost the qualities of flexibility and political creativity that were once more common.

I recommend reading The Dawn of Everything by David Graeber for more details on societal structures of the past

Organic Maps gets their map data from OpenStreetMap (OSM). All OSM stuff is open source and the data is entered in by volunteers. If your area doesn’t have much yet, you should consider being the change by adding your favorite spots!

Other people have mentioned things like StreetComplete, which is an app that helps you fill in the gaps of some OSM data.