The openness of American culture and its democratic principles made the United States a model and a refuge for millions. At the same time, the conviction that American principles are universal has introduced a challenging element into the international system because it implies that governments not practicing them are less than fully legitimate. This tenet—so ingrained in American thinking that it is only occasionally put forward as official policy—suggests that a significant portion of the world lives under a kind of unsatisfactory, probationary arrangement, and will one day be redeemed; in
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