Slavery doesn't mean "unjust forced submission", it means "forced submission". There was slavery before 16th C Atlantic triangular slave trading, there's legal

Slavery doesn't mean "unjust forced submission", it means "forced submission". There was slavery before 16th C Atlantic triangular slave trading, there's legal and illegal slavery, and maybe there's ethical slavery too (or maybe not). Redefining the word so that prison slavery doesn't qualify seems obtuse, counterproductive, and doesn't even have the defense of being historical.