Aztec slaves were generally well-treated. The tribe was allowed to keep their own customs instead of the Aztecs forcing them to follow Aztec culture. Slavery wasn't hereditary so the children of slaves were free, which is very different from other societies' view of slave children. Slaves could also earn their freedom by buying it. However, Aztec slaves were still the most frequently used people for human sacrifices, just like in the Mayan Civilization.