Berlin Wall: A physical barrier constructed by East Germany during the Cold War to separate East Berlin from West Berlin as part of Soviet efforts to prevent people from fleeing communism.
Warsaw Pact: A military alliance established in 1955 between several Eastern European countries under Soviet influence as a counterbalance to NATO (North Atlantic Treaty Organization).
Cuban Missile Crisis: A tense confrontation between the United States and Soviet Union in 1962 when nuclear missiles were discovered in Cuba, leading to fears of nuclear war before tensions eased through negotiations.