Competition between the USA and Soviet Union to develop increasingly powerful nuclear weapons
Nuclear arms race
Up to 1949, the USA thought it could use its nuclear monopoly to deter Soviet attack
By the mid-1950s, the development of nuclear weapons meant any nuclear war would destroy both sides (Mutually Assured Destruction)
This meant the USA and Soviet Union had to find ways to stop disputes turning into dangerous wars involving nuclear weapons
Warsaw Pact
Collective defence treaty involving the Soviet Union and its Eastern European satellite states, set up in 1955 in response to West Germany joining NATO
Warsaw Pact
Gave the Soviet Union direct control over the armed forces of its satellite states, strengthening its grip on Eastern Europe
Meant there were now two opposing military alliances in Europe, NATO and the Warsaw Pact, facing each other across the Iron Curtain
After Stalin died, Soviet leader Khrushchev indicated Soviet control would relax, but when Hungary started to move away from Soviet influence, the Soviet Union tightened its control
Hungary suffered under Stalin's brutal communist rule, with food and industrial products shipped off to Russia and any opposition ruthlessly suppressed
In 1956, Hungarians started demonstrating against communist control, with statues of Stalin pulled down and local communists attacked
Khrushchev appointed a more liberal Prime Minister for Hungary, Imre Nagy, who wanted Hungary to leave the Warsaw Pact and become a neutral country with free elections