The document discusses the Inca, Maya, and Aztec civilizations. For the Inca, it notes they were intelligent and built roads, pyramids for religion, and had mummies, though many mummies were sadly children due to a high child mortality rate. It suggests living in the Inca civilization would be cool. For the Maya and Aztecs, it states they were not chosen to live in because the Aztecs sacrificed many people for their religion and that seemed dumb, while the Maya had over 70 languages spoken in Yucatan, which was seen as too many.