Nazis and Fascists both believed that what they were doing was for the betterment of their country.
Congress passed a law that said that the president had to go through congress to send troops overseas but the president could send troops overseas for 30 days but anything more than that he would have to go through congress
To keep it simple, the Truman Doctrine was an anti-communist document. It basically said that the United States would help prevent the spread of communism.
B. The government gets its power from the consent of the people it governs.