I wanted to mention that society divides naturally into classes. This is similar to what Jordan Peterson mentions about the fact that even lobsters have a hierarchy. There is always one on top. But what I would like to suggest is that once the population of a society gets to be any more than a village, the natural order draws people to divide into classes. [I mean not just division of labor, but rather actual upper, middle, and lower classes. Like a wedding cake.] And people naturally get drawn consciously or unconsciously into the class where they belong.
It is not that some societies are divided into the land owners and the peasants just by law, rather that there is a natural order. In the West the natural order is based on competence. [Not birth].