“Neither slavery nor involuntary servitude, except as a punishment for crime whereof the party shall have been duly convicted, shall exist within the United States, or any place subject to their jurisdiction.”
Kentucky waited till 1976 to ratify it. Still waiting on Mississippi.
And we have far from ended human trafficing. The hard line "illegal immigrant" forces, like the hard line "drug war" advocates, are doing their best to insure the perpetuation of slavery in the sex trades, and to drive up the profit margins for illegal drugs high enough to guarantee there will be enough people willing to accept the risk of selling to anyone willing to buy, and to use their profits to pour billions of dollars into the corruption of legal system.
There are few things more dangerous than "morality" divorced from the reality of its consequences.