To what extent did the US deterrence successfully contain communism?

The US was determined to implement a foreign policy of containment towards the USSR since the beginning of 1945. The US disagreed to requests Stalin made at the Yalta and Potsdam conference, which served to limit Stalin's power and control over Europe. President Truman became even more concerned after receiving George Kennan's Long Telegram in February 1946. This telegram was sent by the US ambassador in Moscow, reporting on the destructive intentions of the USSR. Truman made his policy clear the next year as he declared that it was America's duty to intervene and help countries in pro…