Today, the concept of “national security” is a staple of our political vocabulary, common in everyday language and entrenched in official institutions such as the National Security Council. But it was not always thus. Total Defense by Andrew Preston, a Canadian who is now a history professor at the University of Virginia after nearly 20 years on the faculty of Cambridge University, traces the rise of this concept and how it displaced earlier notions of national defense during the course of the 20th century. It is an important history, and one with underappreciated implications.
The book’s subtitle—The New Deal and the Invention of National Security—distills its thesis: the concept of national security as we know it today (involving military and foreign policy matters not limited to territorial defense) coalesced during the presidency of Franklin Roosevelt. Before the New Deal era, “national security” was used relatively rarely, and often to refer to something more like economic and political stability or, in the 19th century, national unity versus sectional interests. But in the 20th century, a new vocabulary was required to grapple with increasingly grave foreign threats that did not involve the imminent invasion of U.S. territory. Such a vocabulary was largely lacking in World War I, but the term “national security” emerged in the years leading up to World War II.