1. Ancient civilizations in Central and South America such as the Olmec, Maya, Aztec, and Inca developed advanced farming techniques, polytheistic religions, and architectural achievements like pyramids and calendars.
2. The Aztec and Inca empires dominated large regions through military power and established governance systems, but disease and superior weapons helped the Spanish conquistadors like Hernan Cortes and Francisco Pizarro conquer these civilizations in the 16th century.
3. Key cultural aspects included Maya calendars and mathematics, Aztec floating gardens and education systems, and Inca infrastructure like roads and medical knowledge.