If you are going to abolish slavery, that opens up all these other questions: what system of labor is going to replace slave labor? What system of race relations is going to replace the race relations of slavery? Who is going to have power in the post-war South? The Emancipation Proclamation doesn't answer that question, but it throws [it] open.

A man working for wages his whole life is not really free. That is why Jefferson said, you have to own land. Southerners said, - and they weren't being hypocritical - they said slavery is the foundation of freedom because if you own slaves, you are freer yourself.

In a democratic society, as Max Weber said, what is possible is only possible because some people have demanded the impossible. The abolitionists helped to create a public discourse in which men like Lincoln become possible. That doesn't mean Lincoln is an abolitionist. It means there is a public opinion out there which is being influenced by antislavery sentiment.

Colonization was the idea that once slavery ended African-Americans should be encouraged - or required, in some people's view - required to leave the country. It's part of an attitude toward the abolition of slavery which says America should not be a slave society, but it can never be a multiracial society. You can never have free black and white people living together.

I don't [even] know the number of books on Abraham Lincoln. Ten thousand, twelve thousand? I have seen various numbers. It seems like every generation is always trying to come to terms with Lincoln.

A new future requires a new past.

Lincoln sees slavery in some ways as a theft of labor. A slave is a laborer who is being denied the fruits of his labor.