that doesn't make sense at all. personal liberty and slavery are not irreconcilable. the rights provided by the constitution cannot infringe upon inalienable rights, of which life and freedom stand highest, and the "right" to slavery would most definitely infringe upon another's freedom.
taks
There was no inalienable right unless you were part of the elite when the consititution was written. And liberty and slavery are quite obviously opposites. Liberty and freedom from opression were the the same ideas as those embodies in the french revolution, only the 'citizens' were merely the ruling elite, not the breath of society. They barely even qualified as the bourgeois class that characterise the end of feudalism seeing how such a large percentage of them lived like supreme lords on their plantations.
Until you take those ideals to their ultimate conclusion, an egalitarian democracy, they remain unfulfilled and self contradictory, which is why I put the watermark some time around the end of the civil rights movement.