How advanced were the Mayan, Aztec, and Incan Civilizations? What were their Major Accomplishments?

They were very much involved and successful in advancement of their civilization. They developed math and first realized a zero value. They recorded their history in the form of the Aztec Calendar Stone. Currently Archeologist are seeing more recorded valuable history in the Aztec Calendar Stone. I believe that in the future, perhaps not in the near future, but in the future we will have to admit that all human life did not begin only in the "Cradle of Civilization" along the Nile River Valley. If you spin the globe and notice the longitudinal ring that crosses the Cradle of Civilization and where the same ring crosses central/south America you may want to search there for evidence of a second "Cradle".