In the twentieth century, no country has influenced international relations as decisively and at the same time as ambivalently as the United States. No society has more firmly insisted on the inadmissibility of intervention in the domestic affairs of other states, or more passionately asserted that its own values were universally applicable. No nation has been more pragmatic in the day-to-day conduct of its diplomacy, or more ideological in the pursuit of its historic moral convictions. No country has been more reluctant to engage itself abroad even while undertaking alliances and commitments
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