Abstract
After World War II, Europe was destroyed and two superpowers emerged; the United States and the USSR. The United States was the only state to have the atomic bomb and used the massive weapon against Hiroshima and Nagasaki, Japan, and the USSR was important because of the fight against Nazi Germany. The Red Army liberated the east part of Europe and the US army liberated the west part of Europe. After the end of the War, tension increased between the two former allies. USSR refused to withdraw the soldiers from Europe and start to constitute a glacis with those countries, in order to protect its own borders. In 1947, According to the Truman Doctrine of the Containment, the United States perceived the expansion of the USSR as a threat for Europe and created the Marshall Plan.
