Since you mentioned "human development" I have to consider that you also mean "humans enslaving other humans." (I know, it is rather obvious, but sometimes you need to be clear where you are going.) Let's explore the "evolution" idea, at least, by asking an implied question or two.
There is a basic principle that something persists (on the evolutionary time-line) if there is an advantage for it to persist or at least that there is no disadvantage associated with it (i.e. to persist, you must gain advantage or at worst break even). For slavery to persist, there must be a persistent reason. BUT there is also a secondary effect here. Evolution includes an element commonly called "survival of the fittest." To uphold the premise that slavery is in some way evolutionary, you must ALSO explain why the less fit nonetheless survive. It even gets worse than that, since there is only one (human) race and thus you cannot actually claim a racial advantage - the slavers and enslaved are of the same race. (This latter point is proved by multi-generational cross-fertility between the groups.)
It is also possible to discuss behavior that leads to slavery or other variants of dominance, but there, we open Pandora's Box of ways of dominance, including physical, sexual, monetary, political, intellectual.... In that sense, you could say that slavery is actually a hold-over of the tendency of tribes of animals (not limited to humans) to establish dominance over a territory, to assure "the ascendancy of me and mine over thee and thine." In which case you would have to say that slavery per se is merely a symptom of our saurian territorial instincts based on the survival factor that a herd of critters must have a certain square footage to support themselves, to have sustainable food sources sufficient not only for the males but for their mates or breeding critters.
Tribes would thus chase away other tribes so they could have larger hunting grounds. Males in a herd would chase away rivals for the best females (or the most, or both). And in modern terms, businesses compete and hope they can sink their competition.
Therefore, my question is whether your premise includes the possibility that slavery is merely one manifestation of evolutionary tendencies for tribal survival behavior, in this case by cutting off the access of the dominated to a means of survival.
That should be enough to start at least SOME discussion.
