This thoughtful re-examination of the history of U.S. economic growth is built around a novel claim, that potential output grew dramatically across the Depression years (1929-1941) and that this advance provided the foundation for the economic and military success of the United States during the Second World War as well as for the golden age (1948-1973) that followed. Alexander J. Field takes a fresh look at growth data and concludes that, behind a backdrop of double-digit unemployment, the 1930s actually experienced very high rates of technological and organizational innovation, fueled by the maturing of a privately funded research and development system and the government-funded build-out of the country's surface road infrastructure. This substantive new volume in the Yale Series in Economic and Financial History invites renewed discussions on productivity growth over the last century and a half and on our current prospects.