This document discusses and compares the major pre-Columbian civilizations in Mesoamerica and South America, including the Mayans, Aztecs, and Incas. It provides information on their locations, time periods, representative cities, political and economic systems, religions, achievements, and characteristics. The Mayans had independent city-states ruled by god-kings, with an economy based on maize agriculture and trade. The Aztecs and Incas had emperors and relied heavily on maize agriculture, with the Aztecs also collecting tribute from conquered peoples. The Incas developed advanced terraced farming and used the llama for transportation and labor. All three civilizations practiced polytheistic religions with ancestor