Historian David Kennedy looks at Franklin D. Roosevelt’s leadership by exploring how he guided the United States through the twin upheavals of the Great Depression and World War II. Kennedy explains how FDR reshaped federal power, responded to mass economic hardship, and slowly steered a largely isolationist nation toward global responsibility. The discussion highlights the weaknesses of the pre–New Deal government, Roosevelt’s innovative (and sometimes improvised) approach to rebuilding institutions, and the ongoing historical debates over what he was trying to achieve and how successful he really was. Overall, the exchange paints FDR as both a bold domestic reformer and a key architect of the postwar international system that defined American leadership for decades.