Look you will find me a proponent of many other Native American civs. Its just unlikely for one from South America to be added in my opinion. Depending on how archaeology goes I could see a civ like the Chachapoya making it in 15 years. But as of now, there is little name recognition in the US.
And its not like the Pueblo/Anasazi/Hohokam weren't a valid civ or an unimportant civ
They were huge traders, trading goods from all across N. America to Mesoamerica. They actually built somewhat of a tributary empire, hundreds of miles of canals, their most populated city reached about 40,000 people, had complex architecture, etc.
And if you watched the stream, you may have learned that their culture existed for nearly a thousand years, resisting many invaders. Their defeat of the Spaniards in the 1600s is one of the most important/decisive defeats [And possibly the most decisive] ever inflicted on a European empire by Native Americans. The Spanish were forced to scrap their plans of settling the internal US and only 2,000 survivors were left of the Spanish colony. The Pueblo were also the Native Americans that brought horses to the Americas ironically. After their defeat of the Spaniards they captured thousands of horses, a lot of which they let run wild and a lot of which they traded to other Native American Civs (like the Apache)