According to what was presented, I believe that the Inca civilization was the most viable one from the other five Native American cultures. First, they formed one of the most highly developed societies of America. They lived in a region full of landforms, the Andean America, and they made great achievements in agriculture, developing new methods of planting and an irrigation system. Second, this society constructed a road system spread out over the whole Empire, where information, products and people would travel from city to city. Finally, they had a well-developed social system where all obeyed the Emperor, as they used to call the Inca (descendent of the sun).
As they never developed a writing system, most of our knowledge about this civilization is what the Europeans registered when they first came to America, but thanks to them we know much more about the Inca’ amazing culture and we are still learning even more.