sooner or later every country gets the foreign policy it can afford. In 1945, the industrial output of the United States roughly equaled that of the rest of the world. Under the circumstances, the American ambitions that inspired the Bretton Woods financial system, the Marshall Plan, and the Cold War policy of global containment of communism were not unreasonable. But in the last seven decades America's comparative economic strength has declined dramatically, and the country can no longer support such a sweeping interpretation of the national interes