By 1946, the Soviet Union had successfully spread communism through Eastern Europe, with Poland, Albania, Hungary, Romania, and Bulgaria all having communist governments loyal to Stalin.
Churchill referred to the divide between the east and the west of Europe as the Iron Curtain.
The Soviet Union used the secret police force to control the countries in Eastern Europe.
Truman decided to respond with a policy known as the Truman Doctrine, which was a policy of containment designed to stop the further spread of communism.
Truman persuaded the US Congress to grant him four hundred million dollars of aid to help the situation in Greece and Turkey, making Turkey a strong ally of the United States and helping the monarchists in Greece.
General Marshall assessed the situation in Europe after World War Two, finding that the country's economies had been ruined and there was an extreme shortage of all supplies.
General Marshall proposed a plan known as the Marshall Plan, which provided seventeen billion dollars of aid to help rebuild Europe.
Stalin was suspicious of Marshall Aid, as a result, he banned communist states from applying to it.
Stalin set up his own version of Marshall Aid, known as Comecon, at a high level.
Stalin responded with the Berlin Blockade, fearing that Germany was being built up.
The Berlin Airlift was used to fly supplies into Berlin, which was under Soviet control.
Germany was formally divided into two countries, the West, the Federal Republic of Germany, and the East, the German Democratic Republic, under Soviet control.