The strong do rule the weak, by hook or by crook. That has been, is, and always will be the case. "Slavery" isn't a black/white condition, there are shades of gray. I recall reading the Florida case where citizens were required to work 1 or 2 weeks a year on a road crew. Slavery? No, held the court. The draft is another example of involuntary submission.
As it stands, even indentured servitude is referred as slavery, even if a person enters the servitude agreement voluntarily.
I'd also point to the Bible for its exhortations and instructions regarding the treatment of servants.
Sort of like “deriving their just powers from the consent of the governed.” Did you consent to the Constitution? I didn’t. I was born under it. When do we get to vote on it?