[R]eligious commitment formed the backbone of much of the North's hostility to slavery. - Allen C. Guelzo

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.

Protecting slavery, Lincoln declared, had become the chief irritant that provoked the Southern states to reach for the solution of disunion.

Lincoln is, both culturally and in terms of his economic thinking, firmly and immovably located in the center of what we can call liberal democratic thought in the 19th century. He is very much market oriented, with tremendous confidence in the power of a capitalist society to transform for the better, and he believes in opening the possibilities of that society to as many as possible. To him, that’s what’s coterminous with liberty.