"People today often want to separate slavery, and say that Lincoln was interested in preserving the union and not in destroying slavery. No, that gets it exactly wrong. The two are as knotted together as a rope, because the only union worth preserving is a union that has abjured slavery. So for Lincoln to get rid of slavery is to purge America of the aristocratic poison. He once said that slavery was the one retrograde institution that was poisoning the American republic, keeping the American republic from realizing its full potential."