Answer:
the answer is the first one
Previous American policy had centred around Isolationism. They did not want to get involved in foreign affairs and believed they didn’t need to. With the Truman doctrine, they wanted to contain the spread of communism, so they were prepared to fight wars and become involved on global politics to prevent such from happening.
So an iron triangle comprises or makes the base of the policy making relation over or among the congressional committees,the bureaucracy, etc.
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