The story of how FDR and fellow New Dealers created the idea of national security, transforming the meaning of defense and vastly expanding the US government’s responsibilities. National security may seem like a timeless notion. States have always sought to fortify themselves, and the modern state derives its legitimacy from protecting its population. Yet national security in fact has a very particular, very American, history—and a surprising one at that. The concept of national security originates in the 1930s, as part of a White House campaign in response to the rise of fascism. Before then, national self-defense was defined in terms of protecting sovereign territory from invasion. But President Franklin D. Roosevelt and his circle worried that the US public, comforted by two vast oceans, did not take seriously the long-term risks posed by hypermilitarization abroad. New Dealers developed the doctrine of national security, Andrew Preston argues, to supplant the old idea of
