NATO: A military alliance formed in 1949 by several Western countries, including the United States, as a response to Soviet aggression during the Cold War.
Iron Curtain: A term coined by Winston Churchill referring to the division between communist and non-communist countries in Europe during the Cold War.
Berlin Wall: A physical barrier constructed by East Germany in 1961, separating West Berlin (capitalist) from East Berlin (communist). It became a symbol of the Cold War divide.