The document summarizes the major Mesoamerican civilizations - Olmec, Teotihuacan, Maya, Aztec, and Inca. It describes their origins, locations, political and social structures, economies, religions, and achievements. It also discusses their eventual declines, including the conquest by the Spanish for the Aztec and Inca. The Olmec, Teotihuacan, and Maya flourished in Mesoamerica before the rise of the powerful Aztec Empire in central Mexico and the Inca Empire in the Andes Mountains of South America.