[M]any quite frankly fought to protect slavery, which laid on the survivors of the rebel armies an incubus to which few were willing to admit in alte… - Allen C. Guelzo

The attempt by eleven southern—and slaveholding—states to secede from the Union in the winter and spring of 1860-61 presented the United States with the greatest internal political challenge it had ever faced. Because the Constitution had created a federal Union, secession (which broke the ties of Union) was a dagger at the heart of the American polity. The fact that this secession was motivated by Southerners' determination to protect their investment in human slavery added a cruel twist of the blade. Not only did secession fracture the Union, it did so on behalf of a practice which obliterated the fundamental natural right to liberty, which the federal Constitution was supposed to protect.

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

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.