These were two cornerstone policies of the early American Cold War strategy.

The Truman Doctrine was a policy announced by President Harry S. Truman in 1947.

It stated that the United States would provide political, military, and economic assistance to all democratic nations under threat from authoritarian forces.

The doctrine was first applied to Greece and Turkey, which were facing communist-backed insurgencies.

It formally established the U.S. policy of 'containment' of Soviet expansion.

The Marshall Plan, proposed by Secretary of State George Marshall in 1948, was an economic extension of this policy.

It offered billions of dollars in economic aid to help rebuild the war-torn economies of Western Europe.

The underlying goal was to restore economic stability and prosperity in order to prevent the rise of communism in Western Europe.

The Soviet Union and its Eastern European satellites rejected the offer of aid.

The Marshall Plan was highly successful, leading to a rapid European economic recovery and solidifying the Western alliance.