Okay, to understand what I'm talking about, we need to look at some previous models of slavery. Let's go to the Thought Bubble. The Greeks were among the first to consider otherness a characteristic of slaves. Most Greek slaves were barbarians, and their inability to speak Greek kept them from talking back to their masters and also indicated their slave status. Aristotle, who despite being spectacularly wrong about almost everything, was incredibly influential, believed that some people were just naturally slaves, saying, It is clear that there are certain people who are free and certain people who are slaves by nature, and it is both to their advantage and just for them to be slaves. This idea, despite being totally insane, remained popular for millennia. The Greeks popularized the idea that slaves should be traded from far away, but the Romans took it to another level.