This document provides information about three ancient civilizations in the Americas: the Maya, Aztec, and Inca. It discusses the origins and locations of each civilization, as well as details about their governments, religions, architecture, and cultural practices. It also describes key events and factors that contributed to the decline of each civilization, such as disease outbreaks and conquest by Spanish colonizers. The Maya inhabited Mesoamerica and built cities with temples and pyramids. The Aztecs founded Tenochtitlan in central Mexico and practiced human sacrifice. The Inca ruled an empire from Cusco in the Andes mountains and constructed elaborate roads and sites like Machu Picchu.