What does it mean to be an American? With the nation's 250th birthday in sight, we asked Americans to reflect on what the founders built, who they left out and what in that history has been left unresolved. In a conversation with Judy Woodruff, Pulitzer-Prize winning author and historian Joseph Ellis said of the founders, "We must acknowledge that all of these people were human beings. They weren't gods." Judy Woodruff reports from Vermont, a state whose motto is "Freedom and Unity," for her ser