After World War II, how did Americans view the role of the United States?

Following World War II, the United States emerged as one of the two dominant superpowers, turning away from its traditional isolationism and toward increased international involvement. The United States became a global influence in economic, political, military, cultural, and technological affairs.

although the legal justifications for the trials and their procedural innovations were controversial at the time, the nuremberg trials are now regarded as a milestone toward the establishment of a permanent international court, and an important precedent for dealing with later instances of genocide and other crimes

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