"I think the American Revolution is the most important event since the birth of Christ in all of world history. … I mean, it turned the world upside down," Burns told CBS News' John Dickerson in an interview set to air on "Face the Nation with Margaret Brennan" on Sunday.

As the U.S. celebrates 249 years since the signing of the Declaration of Independence, CBS Evening News co-anchor John Dickerson spoke with documentarian Ken Burns about his new film on the American Revolution and the importance of telling the story of American history.