Iron Curtain, a name for the communications barrier between the Communist countries of central and eastern Europe and the rest of the world. The Iron Curtain existed for some 45 years after World War II. The barrier was maintained through official restriction by these countries on travel and international exchange of information. The barrier ceased to exist after the collapse of most of the European Communist regimes in the late 1980's. Winston Churchill popularized the phrase in a speech at Westminster College in Fulton, Missouri, in 1946.
Cold War, the struggle for power and influence in the years after World War II between the Communist nations led by the Soviet Union (the East) and the Western allies headed by the United States (the West).
V-J Day meant the end of World War II, but not the end of global tensions. The main area of conflict was between the United States and Russia which led to a tense nuclear arms buildup. Read about how the end of World War II gave rise to the Cold War.