On how the current political divisions in the U.S. compare with the divisions during the revolutionary period, Ken Burns says, "We're always divided, it ebbs and flows a little bit, but we always have big differences," citing the controversy over the Vietnam War, the Civil War, and other divisive moments. Tune in TOMORROW at 10:30amET for more from John Dickerson's interview with the documentary filmmaker about his new project, "The American Revolution". | Face The Nation

What do you really know about our 25th president? Get "President McKinley," http://amzn.to/2x1s3oN | History in Five