National security - how it started and how it's changed

It was Franklin Roosevelt who came up with the notion of national security, to persuade Americans to get involved in World War ll. His pitch was that Americans had social security, domestically, under the New Deal. But to keep the world's instability at bay, and protect the 'American way of life', participation in world affairs was necessary. Guest: Professor Andrew Preston, author of 'Total Defense: The New Deal, and the invention of national security’ (Harvard University Press) Producer: Ann Arnold