Question

What event triggered the United States to issue the Truman Doctrine?

the Soviet Union's development of an atomic bomb

Britain's inability to assist governments in Greece and Turkey

Churchill's declaration that an iron curtain had fallen across Europe

the failure of the Marshall Plan to assist European economic recovery

Answer 1

Britain's inability to assist governments in Greece and Turkey

Answer 2

http://en.wikipedia.org/wiki/The_Truman_Doctrine

Answer 3

B) Britain's inability to assist governments in Greece and Turkey