The Inca and Aztec empires had similar economic structures centered around state control and labor. Both empires organized large labor forces through tributary systems that required common people to work for the state. This state labor allowed for massive infrastructure projects and resource management. However, the empires differed in their social structures, with the Inca having a strict class divide and the Aztecs practicing sacrificial rituals. The Spanish conquest disrupted both economies, though Inca social hierarchies were more thoroughly dismantled.