The US could not take back the countries that the Soviet Union had already converted. The only way that they could stop them from spreading their influence was to contain them.
The soviet union was trying to grow their influence made a wall to try and prevent the United States from reaching their part of Germany. The Soviet Union did this so they could take prevent the U.S from getting supplies to their part. This did not work because the U.S started to drop supplies from the air. This messed up the Soviets plans and they later gave up on this plan and let up the wall.
Western Europe (Marshall plan)US Gave 13 billion To Rebuilding after WWllYes B/C W.Europe remained democratic West Berlin Soviet Union block added our access to the w.BerlYes the soviets leave and W. Berlin is freeTurkey and Greece Truman Doctrine )We gave them money to not help communist Yes it was successful