At the end of World War II, the United States and the USSR emerged as the world’s major powers. They also became involved in the Cold War, a state of hostility (short of direct military conflict) between the two nations. The clash had deep roots, going back to the Russian Revolutions of 1917, when after the Bolshevik victory, the United States, along with Britain, France, and Japan, sent troops to Russia to support the anti-Communists. During World War II, the United States and the USSR were tenuously allied, but they disagreed on tactics and on postwar plans. After the war, relations deteriorated. The United States and the USSR had different ideologies, and they mistrusted each other. The Soviet Union feared that the United States, the leader of the capitalist world, sought the downfall of Communism. The United States felt threatened by Soviet expansionism in Europe, Asia, and the western hemisphere.
The United States and the Soviet Union disagreed over postwar policy in central and eastern Europe. The USSR wanted to demilitarize Germany to prevent another war; to control Poland to preclude any future invasion from its west; and to dominate Eastern Europe. Stalin saw Soviet domination of Eastern Europe as vital to Soviet security. Within months of the war’s end, Stalin installed pro-Soviet governments in Bulgaria, Hungary, and Romania. Independent Communist takeovers in Albania and Yugoslavia provided two more “satellite nations.” Finally, the Soviets barred free elections in Poland and suppressed political opposition. In March 1946 former British prime minister Winston Churchill told a college audience in Fulton, Missouri, that a Soviet-made “Iron Curtain” had descended across Europe.
In 1947 the Cold War conflict centered on Greece, where a Communist-led resistance movement, supported by the USSR and Communist Yugoslavia, threatened to overthrow the Greek monarchical government, supported by Britain. When the British declared that they were unable to aid the imperiled Greek monarchists, the United States acted. In March 1947 the president announced the Truman Doctrine: The United States would help stabilize legal foreign governments threatened by revolutionary minorities and outside pressures. Congress appropriated $400 million to support anti-Communist forces in Turkey and Greece. By giving aid, the United States signaled that it would bolster regimes that claimed to face Communist threats. As George Kennan explained in an article in Foreign Affairs magazine in 1947, “containment” meant using “unalterable counterforce at every point” until Soviet power ended or faded.
In 1947 the United States further pursued its Cold War goals in Europe, where shaky postwar economies seemed to present opportunities for Communist gains. The American Marshall Plan, an ambitious economic recovery program, sought to restore productivity and prosperity to Europe and thereby prevent Communist inroads. The plan ultimately pumped more than $13 billion into western European economies, including occupied Germany. Stalin responded to the new U.S. policy in Europe by trying to force Britain, France, and the United States out of Berlin. The city was split between the Western powers and the USSR, although it was deep within the Soviet zone of Germany. The Soviets cut off all access to Berlin from the parts of Germany controlled by the West. Truman, however, aided West Berlin by airlifting supplies to the city from June 1948 to May 1949.