All three well-developed civilizations—the Aztecs, Incas, and Chinese—used a labor force or tribute system. However, each of them has unique systems and demands in this area. The Aztecs had many people under their control. They demanded payment in the form of human sacrifice as tribute. As the Aztecs' Gods were extremely bloodthirsty, they took people from neighboring tribes and sacrificed them in order to avoid making the sacrifice themselves.
The Inca labor system appears to have been the most just. With the exception of the emperor, everyone in this society was required to work for both their own and everyone else's best interests. The Chinese system of tribute was predicated on the conquest's population's forced labor. They were required to labor, produce a set of products, and then provide the governing bodies a portion of those things or a portion of the profits from those goods.
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