What Did the Truman Doctrine Declare as Being Vital to the Interests

Multiple Choice

What did the Truman Doctrine declare as being vital to the interests of the United States?

A) Pledging support to communist states in order to offset the influence of the USSR
B) Pledging support to non-communist forces in order to keep the influence of domestic and foreign communism within countries at bay
C) The same thing as the Marshall Plan
D) All of the above