The Cold War was a period of geopolitical tension between the Soviet Union and its satellite states and the Western powers led by the United States. It began after World War 2 and involved military buildups, espionage, propaganda, and economic competition. Both sides sought to spread their opposing ideologies - communism for the Soviets and capitalism for the US. The launch of Sputnik 1 by the Soviet Union in 1957 kicked off the Space Race and led the US to establish NASA to catch up in space exploration, culminating in the US moon landing in 1969. Throughout the Cold War, both militaries developed advanced technologies like nuclear weapons and spy planes to gain military advantages over the other. The Cold War ended in the early 1990s