What I think most people don't realize is that when slavery was outlawed the net result was to render the poor into a commons, making them nobody's legal responsibility if they cannot assume that charge themselves. The obvious result led directly to the welfare state, particularly as churches started to fail. The welfare state then made the poor so expensive to hire that nobody could afford them, thus assuring both a monopoly and a steady supply of dependents. Then it set about enlarging that supply via laws intended to destroy the family.
Meanwhile, the 14th Amendment citizenship clause effectively declares all American citizens, "subjects." And there I thought we fought a revolution to end subjugation.
You forgot to mention to begin, support and continue a welfare state/safety net, one needs to make (economic) slaves of others.
IOW: They made slavery of SOME illegal to make slaves of us ALL.