The Cold War was an ideological struggle between capitalist Western nations led by the US and communist Eastern bloc nations led by the Soviet Union from 1947 to 1990. They engaged in espionage, an arms race including nuclear weapons, and competing for influence in the Third World. This rivalry included events like the Berlin Blockade, formation of NATO and Warsaw Pact alliances, Soviet launch of Sputnik satellite, Cuban Missile Crisis, and US involvement in Vietnam War until the fall of the Berlin Wall helped end the Cold War.