The
Cold War was a period of global geopolitical tension and struggle for ideological and economic influence between the United States and the Soviet Union (USSR) and their respective allies, the Western Bloc and the Eastern Bloc, that started in 1947, two years after the end of World War II, and lasted until the fall of the Soviet Union in 1991. The term
cold war is used because there was no direct fighting between the two superpowers, though each supported opposing sides in major regional conflicts known as proxy wars. Aside from the nuclear arms race starting in 1949 and conventional military deployment, the struggle for dominance was expressed indirectly via psychological warfare, propaganda campaigns, espionage, far-reaching embargoes, sports diplomacy, and technological competitions such as the Space Race.