The document discusses major events in US-Soviet relations and the Cold War during the 1950s and early 1960s. This included the US and USSR engaging in an intense arms race, with both sides rapidly developing new nuclear weapons like the hydrogen bomb. John Foster Dulles pursued a policy of brinkmanship to contain Soviet expansion. The Soviet Union launched Sputnik I in 1957, kicking off the Space Race. Under Khrushchev, the Soviets initially gained prestige but relations began improving as he advocated for peaceful coexistence between the superpowers.