The document summarizes Postclassic Mesoamerica between 1000-1500 CE, including the rise and society of the Aztec Empire and its religion and economy. It also describes the Inca Empire in South America, how it expanded across the Andes region, its techniques of rule, cultural achievements, and comparisons to the Aztec Empire. Finally, it discusses the diversity of indigenous peoples in the Americas outside these main empires.