What was a common feature of civilizations in both Mesoamerica and South America during the classical era?

A common feature of civilizations in both Mesoamerica and South America during the classical era was the development of complex social hierarchies and centralized political structures. Both regions saw the emergence of powerful city-states and empires, such as the Maya in Mesoamerica and the Inca in South America, which were characterized by organized governance, religious institutions, and extensive trade networks. Additionally, they shared advancements in agriculture, including techniques like terracing and irrigation, which supported their growing populations and urban centers.