Waiting for answer This question has not been answered yet. You can hire a professional tutor to get the answer.
History homework
Watch the following clip of President Harry Truman at https://www.youtube.com/watch?v=wmQD_W8Pcxg
According to the Truman Doctrine as articulated in this video clip, why was it America's duty to intervene in Greece? How was this a departure from American foreign policy before World War II?