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D. Containing the spread of Communism.

Explanation:

Often called the Truman Doctrine because of President Harry S. Truman, the US had a policy of containing the spread of communism from the beginning of the Cold War, this mainly focused on the fact that if one country was communist, the countries around it had the potential to follow its lead.

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