If the Cold War feels like a list of leaders, crises and strange abbreviations, start here. You do not need to know everything at once. First, learn the basic story: two former allies became rivals, divided much of the world into competing camps, avoided fighting each other directly, and repeatedly brought the world close to nuclear war.
This page is for AQA A-level History option 2R, The Cold War, c1945–1991. If your course is OCR Cold War in Europe or Asia, some events overlap, but this is not an exact match for your specification.
Before the Cold War: the world in 1945
The Second World War had devastated Europe. Germany had been defeated and occupied. Britain and France were exhausted. Two states now possessed unmatched power: the United States of America and the Soviet Union (USSR).
They had fought on the same side against Nazi Germany, but they did not share the same vision of the future.
- The USA was a capitalist democracy. Most businesses were privately owned, elections chose the government, and American leaders wanted trade and political systems open to Western influence.
- The USSR was a communist one-party state ruled by Joseph Stalin. The state directed the economy, political opposition was suppressed, and Soviet leaders wanted friendly governments on their western border after two devastating invasions through Europe.
Both sides talked about security. Each often saw the other side’s search for security as aggression.
Five words to learn first
- Capitalism: an economic system in which most property and businesses are privately owned.
- Communism: in Soviet practice, a one-party political system with a state-directed economy, claiming to build an equal society.
- Superpower: a state with enough military, economic and political strength to influence events across the world.
- Containment: the American policy of stopping communism from spreading further.
- Satellite state: a formally independent country heavily controlled by a more powerful state; the term is often used for Soviet-dominated Eastern European states.
Small task 1
In two sentences, explain why the USA and USSR could be allies against Hitler but rivals after his defeat.
You can answer from the section above. A sound answer mentions their shared enemy and their different systems or aims.
Story 1: Europe divides, 1945–1949
At the Yalta and Potsdam conferences in 1945, the victorious powers tried to agree what should happen after Germany’s defeat. They accepted that Germany and Berlin would be occupied in zones, but disputes grew over Poland, reparations and the political future of Eastern Europe.
The Soviet army already occupied much of Eastern Europe. Stalin helped communist parties take control there. He believed friendly governments created a protective buffer around the USSR. Western leaders saw the destruction of free political choice and feared further Soviet expansion.
In 1947 President Truman promised support for peoples resisting communist pressure. This Truman Doctrine expressed containment. The USA also offered Marshall Aid to help European economies recover. American leaders believed prosperity would make communism less attractive. Stalin saw the plan as an attempt to extend American power and prevented Soviet-bloc states from joining.
Germany became the sharpest point of conflict. The Western powers combined their zones and introduced a new currency. In 1948 Stalin blocked land access to West Berlin, which lay inside the Soviet zone. The Western powers supplied the city by air. Stalin ended the blockade in 1949. Soon there were two German states, and the Western alliance NATO was created.
Small task 2
Why did Marshall Aid worry Stalin? Give one economic reason and one political reason.
You may stop here
If this is new, pause. The essential point is: wartime cooperation broke down because each side believed the other was reshaping Europe in a threatening way.
Story 2: the Cold War becomes global, 1949–1963
In 1949 the communist victory in China and the Soviet Union’s first atomic bomb changed the balance. American leaders feared that communism was advancing. In 1950 communist North Korea invaded South Korea. A US-led United Nations force intervened. When it advanced towards China, Chinese forces entered the war. Fighting ended in an armistice in 1953, close to the original dividing line. Korea showed that the Cold War could become a devastating “hot” war through allies and local conflicts even when American and Soviet forces avoided formally declaring war on one another.
After Stalin died in 1953, Nikita Khrushchev spoke of peaceful coexistence, but this did not mean friendship. In 1956 Soviet forces crushed the Hungarian uprising, showing that Moscow would use force to preserve its control in Eastern Europe. The arms race accelerated as both sides built hydrogen bombs and missiles capable of destroying cities within minutes.
Berlin remained dangerous. Large numbers of East Germans left through Berlin, embarrassing and weakening East Germany. In 1961 the East German authorities, backed by the USSR, built the Berlin Wall. It reduced emigration but became a symbol of division and coercion.
The most dangerous confrontation came in Cuba. Fidel Castro’s revolutionary government aligned with the USSR after relations with the USA collapsed. In October 1962 American reconnaissance discovered Soviet nuclear missile sites on Cuba. President Kennedy imposed a naval blockade, while Khrushchev initially continued the operation. After thirteen tense days, the USSR removed the missiles. The USA publicly promised not to invade Cuba and secretly agreed to remove American missiles from Turkey.
Small task 3
Why did the Korean War make the Cold War more dangerous? Use the words global, China and superpowers.
Small task 4
Write a three-step chain explaining the Cuban Missile Crisis:
- Why Soviet missiles were placed in Cuba.
- How the USA responded.
- How the crisis ended.
Story 3: confrontation and cooperation, 1963–1979
The Cuban crisis frightened both governments. They established a direct communications link and agreed a limited nuclear test ban. This was cooperation, but it did not end conflict.
The USA greatly expanded its war in Vietnam under President Johnson. American leaders argued that South Vietnam had to be defended from communist takeover. They had overwhelming firepower, but North Vietnam and the National Liberation Front could sustain a long war and draw on nationalism as well as communism. The 1968 Tet Offensive was a military setback for communist forces, yet it damaged American confidence by showing that victory was not close.
President Nixon reduced American ground forces through Vietnamisation, while bombing expanded into Cambodia and Laos. The USA left the war after the 1973 Paris agreement; North Vietnam defeated South Vietnam in 1975.
At the same time, Nixon improved relations with communist China and pursued détente, a relaxation of tension, with the USSR. Arms agreements such as SALT limited parts of the nuclear competition. European détente included West Germany’s Ostpolitik and the 1975 Helsinki Accords. Cooperation had practical limits: neither side abandoned its weapons, allies or global interests.
Small task 5
How can the Vietnam War and détente belong to the same period? Answer in two or three sentences. The key is that the Cold War contained conflict and negotiation at the same time.
You may stop here
You now have the first two thirds of the course story: division, globalisation, nuclear danger, Vietnam and limited cooperation.
Story 4: renewed tension and the end, 1979–1991
Détente weakened in the late 1970s. The Soviet invasion of Afghanistan in 1979 produced a strong American response. President Reagan, elected in 1980, increased defence spending, used fierce anti-Soviet language and proposed the Strategic Defense Initiative, often called “Star Wars”. Conflict and intervention also continued in Africa and Latin America.
The decisive change came after Mikhail Gorbachev became Soviet leader in 1985. The USSR faced economic stagnation, the heavy costs of military competition and a political system that concealed problems rather than solving them. Gorbachev introduced glasnost (greater openness) and perestroika (restructuring). He negotiated arms reductions with Reagan and made clear that the USSR would no longer use force to keep communist governments in power across Eastern Europe.
In 1989 communist governments in Eastern Europe collapsed. The Berlin Wall opened in November, and Germany reunified in 1990. Gorbachev’s reforms also released pressures inside the USSR that he could not control. Soviet republics demanded sovereignty or independence; political rivals challenged him; and a failed coup by communist hardliners in August 1991 further destroyed central authority. The USSR was dissolved in December 1991.
Historians debate why the Cold War ended. Reagan’s pressure mattered, but it is too simple to say that he “won” alone. Soviet economic weakness, Gorbachev’s choices, popular action in Eastern Europe, nationalism inside the USSR and the long-term difficulty of maintaining coercive rule all contributed.
Small task 6
Make two columns headed pressure on the USSR and choices made by Gorbachev. Put at least two examples in each.
Small task 7
Why is “Reagan won the Cold War” an incomplete explanation? Give two other factors from the teaching above.
The whole story in one paragraph
The Cold War grew from the collapse of the wartime alliance and competing attempts to shape the post-war world. Europe divided first, but conflict spread through Asia and then across the globe. Nuclear weapons discouraged direct superpower war while making each crisis potentially catastrophic. Confrontation existed alongside negotiation, especially during détente. The conflict ended when Soviet economic and political weakness combined with Gorbachev’s reforms and refusal to enforce the Eastern European empire by violence, allowing popular and national movements to dismantle communist rule.
Small task 8
Cover the paragraph above. Retell the Cold War in five stages, using no more than one sentence for each stage.
Six anchor dates — learn these after the story
- 1947: Truman Doctrine and Marshall Plan announced.
- 1948–49: Berlin Blockade and Airlift.
- 1950–53: Korean War.
- 1962: Cuban Missile Crisis.
- 1979: Soviet invasion of Afghanistan marks a major collapse of détente.
- 1991: dissolution of the USSR.
These dates are a framework, not the whole specification.
What this first guide does not yet cover fully
This is a foundation, not an exhaustive course. You will still need detailed study of:
- the precise aims and actions of individual leaders;
- China, Taiwan, Indochina and the changing Sino-Soviet relationship;
- the military course and consequences of Korea and Vietnam;
- Poland, Hungary, Czechoslovakia and Solidarity in greater depth;
- the arms race, space race, U2 incident and summit diplomacy;
- détente agreements and their limitations;
- Cold War interventions in Africa, Latin America and the Caribbean;
- Afghanistan and the end of tension outside Europe;
- competing historical explanations and the use of primary sources;
- the exact AQA examination question types and timed practice.
That gap is deliberate and honest. The purpose of this page is to give you a connected basic story so that the detailed course has somewhere to fit.
You may stop now
If you can explain why the alliance broke down, how the Cold War became global, why nuclear weapons changed it, what détente meant, and why the Soviet system collapsed, you have built a useful foundation.
Suggested existing Explaining History routes
- Best Podcasts on the Cold War
- Worked Example: Cold War Origins — AQA — use after learning the basic origins story.
- The Yalta Conference
- AQA syllabus and topic routes
Specification source
This draft was mapped to AQA’s official 2R subject content, checked 19 July 2026.
