The agreements made late during World War 2 were soon to become obsolete when the USSR and the Allies couldn't agree on the economic future of Germany. After the US further alienated Joseph Stalin with the Truman Doctrine and the Marshall Plan, the decision was made to divide Germany. The Iron Curtain fell over Europe. East and West Germany would remain symbols of the balance of terror and completely opposite ideologies of the bipolar world during the Cold War for the next 40 years.