"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 America enters the 250th year since the signing of the Declaration of Independence, director Ken Burns tells John Dickerson that the American Revolution was a "civil war" that became a "big world war by the end" and more.