The document discusses three Native American tribes studied: the Mound Builders, Cliff Dwellers, and Aztecs. It provides examples of artifacts from the Aztecs (Montezuma's throne) and an archaeological site dating back to 400 AD. It notes the Cliff Dwellers settled in the Santa Clara Canyon in Arizona for its seclusion amongst the mountains. The author expresses a preference for the Aztecs due to their warrior culture.