The first component specifies norms according to which the international order ought to work and charges the United States with responsibility for enforcing those norms. Call this the American credo. In the simplest terms, the credo summons the United States—and the United States alone—to lead, save, liberate, and ultimately transform the world. In a celebrated manifesto issued at the dawn of what he termed “The American Century,” Henry R. Luce made the case for this spacious conception of global leadership. Writing in Life magazine in early 1941, the influential publisher exhorted his fellow citizens to “accept wholeheartedly our duty to exert upon the world the full impact of our influence for such purposes as we see fit and by such means as we see fit.” Luce thereby captured what remains even today the credo’s essence.3 Luce’s concept of an American Century, an age of unquestioned American global primacy, resonated, especially in Washington. His evocative phrase found a permanent place in the lexicon of national politics. (Recall that the neoconservatives who, in the 1990s, lobbied for more militant U.S. policies named their enterprise the Project for a New American Century.) So, too, did Luce’s expansive claim of prerogatives to be exercised by the United States.
Even today, whenever public figures allude to America’s responsibility to lead, they signal their fidelity to this creed. Along with respectful allusions to God and “the troops,” adherence to Luce’s credo has become a de facto prerequisite for high office. Question its claims and your prospects of being heard in the hubbub of national politics become nil. Note, however, that the duty Luce ascribed to Americans has two components. It is not only up to Americans, he wrote, to choose the purposes for which they would bring their influence to bear, but to choose the means as well. Here we confront the second component of the postwar tradition of American statecraft. With regard to means, that tradition has emphasized activism over example, hard power over soft, and coercion (often styled “negotiating from a position of strength”) over suasion. Above all, the exercise of global leadership as prescribed by the credo obliges the United States to maintain military capabilities staggeringly in excess of those required for self-defense. Prior to World War II, Americans by and large viewed military power and institutions with skepticism, if not outright hostility. In the wake of World War II, that changed. An affinity for military might emerged as central to the American identity. By the midpoint of the twentieth century, “the Pentagon” had ceased to be merely a gigantic five-sided building.