““This is the pattern of American foreign policy: from isolationism to interventionism, from withdrawal to crusading and back again. As a self-proclaimed morally and politically superior country, the United States could remain uncontaminated only by abstaining from involvement in a corrupt world or, if the world would not leave it alone, destroying the source of evil. In short, both the isolationist and crusading impulses sprang from the same moralism. These swings tended, moreover, to be accompanied by radical shifts of mood: from one of optimism, which sprang from the belief that America was going to reform the world, to one of disillusionment as the grandiose objectives the United States had set for itself proved beyond its capacity to reach. Feeling too good for this world, which clearly did not want to be reformed but preferred its old corrupt habits, the nation retreated into isolationism to perfect and protect its way of life. Having expected too much from the use of its power, the United States then also tended to feel guilty and ashamed about having used its power at all.””
