UNOFFICIAL MARK SCHEME FOR QUESTION 5 - POTSDAM 1945, Marshall Plan 1947. These are only sample answers i am offering as a student to give examples.
POTSDAM
Potsdam was the last conference between the superpowers after the defeat of Germany on May 8th 1945. This conference took place between Stalin, and the newly introduced Truman (USA) and Atlee (Britain). This conference discussed agreements on things such as the persecution of Nazi war criminals, the division of Berlin, confirmation of Poland's new borders and the creation of the UN. However, Truman was a hardline anti-communists so tensions in this conference proved to be weary, and therefore was important to international relations as it caused them to decline. Stalin had disagreed over firstly the definition of a 'true democracy' as he believed in one party states. This proved to be important during his expansion over Eastern Europe after 1945, as it caused the creation of the Truman Doctrine and caused massive tensions to rise. Furthermore, the division of Berlin not being agreed upon led to further disagreements over the Berlin Blockade (1948-49) and the Berlin Wall crisis (1961) - ultimately again causing tensions to rise over failed agreements coming into place.
MARSHALL PLAN
The Marshall Plan followed the Truman Doctrine in March 1947, and stated the US would offer $13 billion to Europe, in attempt to help rebuild it. The money was used to help prevent Eastern Europeans fight the expansion of the Soviet Union. This event was important as it caused the worsening of international relations. For example, the US offered $400 million to Greece in 1947 in order to destroy the attempted communist rebellion against the pro-west government. Stalin desired to create a Soviet controlled Eastern Bloc, and the Marshall Plan caused the prevention of this. In bitterness, Stalin retaliated through the creation of Cominform, a way to encourage countries in the Eastern Bloc to reject help from Marshall Aid. Stalin saw Marshall Aid as an unofficial declaration of war, and tensions began to become sour.