The document provides background information on the beginnings of the Cold War between 1945-1949. It discusses the breakdown of the wartime alliance between the US and USSR, with the USSR gaining control over Eastern Europe and the US responding. Students are asked to consider who was more to blame for the outbreak of the Cold War - the US or the USSR. Primary sources from the Yalta Conference suggest tensions and disagreements between Roosevelt, Stalin and Churchill behind their public displays of unity.