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

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

anonymous · Answer

the threat communism spreading to Turkey and Greece

anonymous · Answer

the Soviet Union's development of an atomic bomb <---100% wrong,