Frederik Logevall is a professor of history and one of the foremost American scholars of the Vietnam War. His most recent book, Embers of War: The Fall of an Empire and the Making of America's Vietnam won the 2013 Pulitzer Prize. We sat down at the American Historical Association's 2015 Annual Meeting and talked about French imperialism, LBJ's stubborn personality, the "handcuff" of domestic politics, the uses of counterfactual history, and much more.