The Aztec and Incan civilizations mark the high point of centralized societal development in the Americas before 1492. Identify and discuss the factors that fostered the rise of these two civilizations. Consider such factors as geography, contributions of preceding civilizations, and the economic and political structures of each civilization. In addition, compare and contrast these two civilizations with contemporary civilizations in other parts of the Americas , such as the Iroquois, the mound-building, and the Navajo and Pueblo cultures.