Edexcel IGCSE Cold War Mindmaps: Key Facts Overview

Early Cold War Tensions $1945-1949$

Your Cold War story starts with three major sources of tension that turned wartime allies into enemies. Early politics created the foundation for conflict - Stalin believed in communism (state-owned everything), while Roosevelt and Churchill championed capitalism (private ownership). This fundamental disagreement made each side deeply suspicious of the other's true intentions.

The atom bomb changed everything when America dropped it on Hiroshima and Nagasaki in August 1945, killing 120,000 civilians. Stalin saw this as a direct threat and became determined to create a protective barrier between Russia and the West. By 1949, both superpowers had nuclear weapons - ironically making war less likely but tensions much higher.

Soviet satellite states became Stalin's insurance policy against future German aggression. Countries freed from Nazi control became USSR puppet states, creating a useful buffer zone. However, Truman viewed this as proof that Stalin wanted to spread communism worldwide.

💡 Key Insight: The Kennan and Novikov telegrams in 1946 perfectly captured how each side viewed the other - both convinced their former ally was planning world domination.

Post-War Conferences Shape the World

The three major post-war conferences show how quickly Allied unity crumbled after defeating Nazi Germany. Tehran (1943) was all about teamwork - agreeing to invade Germany from both sides, set up the UN, and work together against Japan. Everyone was still focused on winning the war.

Yalta (February 1945) maintained cooperation on paper. The leaders officially established the UN, agreed on German reparations, and split Germany into four zones. Stalin even promised free elections in Eastern Europe - a promise he'd soon break.

Potsdam (July-August 1945) revealed the cracks in the alliance. New faces appeared - Truman replaced Roosevelt, and Attlee replaced Churchill mid-conference. Berlin got split into four zones despite being deep in Soviet territory, giving Stalin the poorest section.

💡 Key Insight: By Potsdam, both sides were already angry - America over secret atomic bomb testing and lack of free elections in Eastern Europe, Russia over being excluded from major decisions.

The atmosphere had shifted from cooperation to barely concealed hostility in just two years.

The Cold War Takes Shape $1947-1949$

Three major American initiatives transformed the Cold War from political disagreement into global confrontation. The Truman Doctrine (March 1947) announced America's policy of containment - pledging $400 million to help Greece and Turkey resist communism. This marked the official end of cooperation with the Soviet Union.

The Marshall Plan followed three months later, offering $12.7 billion in economic aid to rebuild war-torn Europe. Stalin saw this as 'Dollar Imperialism' - America's attempt to create an economic empire and split Europe permanently. Eastern European countries wanted the aid but Stalin forbade them from accepting it.

Stalin's response came through Cominform and COMECON. Cominform gave him direct political control over satellite states, while COMECON provided an alternative to Marshall Plan aid. The Berlin Blockade (1948) tested Western resolve when Stalin cut off land routes to West Berlin.

💡 Key Insight: The Berlin Airlift proved the West wouldn't abandon Berlin - flying in supplies for over a year until Stalin lifted the blockade in May 1949.

By 1949, Europe was divided into two military blocs with NATO facing off against the Warsaw Pact.

The 1950s: Nuclear Race and Proxy Wars

The 1950s brought de-Stalinisation after Stalin's death in 1953. Khrushchev's secret speech in 1956 criticised Stalin's brutal rule and introduced reforms, creating a slightly more relaxed Soviet society. However, this didn't reduce Cold War tensions.

The nuclear arms race dominated the decade. America led initially (atomic bomb 1945, hydrogen bomb 1952), but the USSR stayed close behind. Both developed ICBMs by 1957, creating the terrifying concept of Mutually Assured Destruction. Spy planes monitored each side's progress - leading to dangerous incidents.

Proxy wars allowed superpowers to fight without direct confrontation. The Korean War $1950-1953$ saw North Korea (backed by USSR and China) fight South Korea (supported by UN/US forces). After Stalin's death, a ceasefire divided Korea permanently - it remains split today.

💡 Key Insight: The Hungarian Uprising (1956) showed the limits of de-Stalinisation - when Hungary tried to leave the Warsaw Pact, Soviet tanks crushed the rebellion, killing 20,000 people.

The West watched but didn't intervene, establishing that Eastern Europe remained firmly in Soviet hands.

Berlin: Symbol of Division

Berlin became the Cold War's most dangerous flashpoint, where East met West in one divided city. The refugee problem started it all - between 1945-1961, over 4 million East Germans fled to the West through Berlin, seeking better living standards and freedom.

Khrushchev's 1958 ultimatum demanded Berlin become a 'free city' to stop the refugee flow, but the West refused. Tensions peaked when 40,000 East Germans crossed to West Berlin in a single day in August 1961. The communist response was swift and brutal.

The Berlin Wall went up on 12th August 1961 - first barbed wire, then concrete barriers that would divide the city for 28 years. At least 130 people died trying to escape, making the wall a powerful symbol of communist oppression versus Western freedom.

The U-2 incident (1960) had already damaged relations when Soviets shot down an American spy plane. Eisenhower's refusal to apologise led Khrushchev to storm out of the Paris Summit, showing how quickly diplomatic progress could collapse.

💡 Key Insight: The Berlin Wall actually reduced war tensions by stopping the refugee crisis, but it became the Cold War's most potent symbol of division for three decades.

Prague Spring and Soviet Control

Czechoslovakia's brief taste of freedom in 1968 showed both the appeal of reform and the limits of Soviet tolerance. Alexander Dubček became Communist Party leader and introduced the Prague Spring - reducing censorship, increasing trade union power, and allowing criticism of government.

Czech citizens embraced these freedoms enthusiastically, but Moscow panicked. Brezhnev worried that other Warsaw Pact countries would demand similar reforms, threatening Soviet control over Eastern Europe. The response was swift and decisive.

On 20th August 1968, 500,000 Warsaw Pact troops invaded Czechoslovakia. Dubček was arrested and forced to abandon his reforms. Around 100 people died in the invasion, and Gustav Husák replaced Dubček with hard-line communist rule for the next 20 years.

The Brezhnev Doctrine emerged from this crisis - declaring that actions in one communist country affected all others. If any communist regime was threatened, all others would intervene to preserve it. This effectively trapped Eastern European countries in permanent communist rule.

💡 Key Insight: The invasion split the communist world - Yugoslavia and Romania condemned it - but showed America wouldn't fight for Eastern Europe, being tied down in Vietnam.

Détente: Temporary Thaw $1963-1972$

By the early 1970s, both superpowers desperately needed to reduce tensions. America was bleeding money and lives in Vietnam (60,000 dead, billions spent), while the 1973 oil crisis made Soviet oil supplies suddenly valuable. The USSR faced its own economic problems and needed to reduce military spending.

Détente represented practical cooperation without abandoning ideological differences. Both sides had nearly triggered nuclear war during the Cuban Missile Crisis and recognised the need for restraint. The Nuclear Non-Proliferation Treaty limited the spread of nuclear weapons to other countries.

The SALT Treaties (1972) marked détente's biggest success. The Anti-Ballistic Missile Treaty limited defensive systems, while the Interim Agreement froze the number of ICBMs and submarine-launched missiles for five years. Nixon and Brezhnev signed these in Moscow, showing superpower cooperation was possible.

However, SALT's limits were significant - no restrictions on conventional weapons, multiple warheads (MIRVs), or strategic bombers. The agreements only lasted five years and didn't end the arms race, just regulated it slightly.

💡 Key Insight: Détente wasn't about ending the Cold War - both sides kept their core beliefs but recognised that bankruptcy and nuclear war weren't viable options.