Why were slaves in the lowest social order class?

Slaves were placed in the lowest social order class primarily because they were considered property rather than individuals with rights or autonomy. This dehumanization allowed societies to justify their exploitation, as slaves were often subjected to harsh labor conditions without compensation. Additionally, cultural and legal systems reinforced this status, perpetuating a hierarchy that privileged free individuals based on race, ethnicity, or social standing. Consequently, slaves were denied basic human rights and dignity, solidifying their position at the bottom of the social hierarchy.