The Cold War was a period of tension between the Western Bloc led by the United States and the Eastern Bloc led by the Soviet Union from 1945-1975. Key events included the division of Europe and Germany after WWII, the formation of opposing military alliances like NATO and the Warsaw Pact, and conflicts in countries like Hungary, Czechoslovakia, Korea, Egypt, Cuba, and Vietnam as the two superpowers backed opposing sides. Though direct military conflict was avoided, tensions regularly flared during events like the Berlin Blockade, Cuban Missile Crisis, and Arab-Israeli conflicts, bringing the world close to nuclear war on multiple occasions before a period of détente in the late 1960s and early 1970s.