Looking ahead to the 250th anniversary of the U.S., Jill Lepore, professor of American history at Harvard University, staff writer at The New Yorker, and the author of several books, including We the People: A History of the U.S. Constitution (Liveright, 2025), digs into the history of the country's founding document and what it means for the country that it is so difficult, but still possible, to change.