This mini-lesson walks you through the whole Edexcel depth study Superpower Relations 1943-72: the origins of the Cold War, how it developed after 1945, the great crises of Berlin, Hungary, Cuba and Czechoslovakia, and the first steps towards détente.
Work through each screen, answer the questions as you go (some are recall, some ask you to explain causes or judge a source) and collect ⭐ stars. Press Start when you're ready.
The Cold War grew out of a deep ideological clash between the two superpowers that emerged from the Second World War:
Why "Cold" War? The USA and USSR never fought each other directly. Instead they competed through an arms race, propaganda, spying and rival alliances — a state of hostility just short of open war.
The wartime leaders — the "Big Three" — met three times. Agreement slid into suspicion as the war ended:
Key change: Roosevelt (who trusted Stalin) had died; the tougher Truman replaced him. That shift helps explain why Potsdam was frostier than Yalta.
In August 1945 the USA dropped atomic bombs on Hiroshima and Nagasaki, ending the war with Japan. It also transformed superpower relations:
Misconception check: the atomic bomb did not start direct fighting between the superpowers. It made both sides more cautious — the fear of destruction is exactly why the war stayed "cold".
Keep this shape in your head. Everything in this topic sits somewhere on it:
After 1945 the USSR set up communist governments across the countries of Eastern Europe it had liberated — Poland, Hungary, Romania, Bulgaria, Czechoslovakia and more — creating a buffer zone of satellite states.
In March 1946, in a speech at Fulton in the USA, Churchill declared that an "iron curtain" had descended across Europe, dividing the free West from the Soviet-controlled East.
Source awareness: Churchill's phrase was a vivid interpretation, not a neutral fact. He wanted to alarm the West about Soviet power. When you meet the quote in an exam, ask who said it and why.
Causation matters more than dates alone. Here is how the origins link together:
In 1947 the USA committed to containment — stopping the spread of communism:
Stalin saw the Marshall Plan as "dollar imperialism" and refused it for the East, setting up Cominform and Comecon to bind the satellite states to Moscow.
Misconception check: the Marshall Plan was economic containment. The idea: prosperous countries are far less likely to turn communist. It was money and rebuilding — not troops or invasion.
The Marshall Plan gave American money to rebuild Western Europe's economies. Prosperous, stable countries were far less likely to turn to communism, so the aid contained its spread — economic help rather than military force.
Germany — and its capital Berlin, stranded deep inside the Soviet zone — was split into four occupation zones. In June 1948 Stalin blockaded West Berlin, cutting all road, rail and canal links to try to force the Western powers out.
The West replied with the Berlin Airlift: for almost a year, planes flew in food and fuel — at the peak, one landing roughly every minute. In May 1949 Stalin lifted the blockade, defeated.
Consequence: the crisis split Germany in two — the Federal Republic (West) and the Democratic Republic (East) — and pushed the West to form NATO.
The crisis hardened Europe into two armed alliances:
Tap an event on the left, then tap its significance on the right. Match all four.
From 1949, when the USSR tested its own atomic bomb, both sides raced to build ever more powerful weapons — the H-bomb, long-range missiles and huge stockpiles.
This produced the grim logic of Mutually Assured Destruction (MAD): if either side attacked, both would be destroyed. Terrifying — but it also made both superpowers very cautious about ever fighting directly.
Link back: MAD is the deep reason the Cold War stayed "cold". The weapons were real; the direct war never came.
After Stalin's death, Khrushchev spoke of "de-Stalinisation" and peaceful co-existence — raising hopes in the East. In 1956 Hungarians rose up: reformer Imre Nagy promised free elections and to leave the Warsaw Pact.
Khrushchev could not allow a satellite to break away. In November 1956 Soviet tanks rolled into Budapest and crushed the uprising; thousands died and Nagy was later executed.
Source awareness: the West protested loudly but sent no military help — a sign of the limits of "roll-back". Western and Soviet accounts of Hungary read very differently; always weigh the origin of a source.
Through the 1950s, millions of East Germans — many of them skilled workers — fled to the prosperous West through the open border in Berlin. This was a huge embarrassment for the USSR.
In August 1961, on Khrushchev's orders, East Germany sealed the border overnight and built the Berlin Wall, cutting the city in two.
Significance: the Wall stopped the flow of refugees and became the great physical symbol of a divided Europe — the "Iron Curtain" made of concrete. Yet it also, grimly, stabilised the crisis.
Huge numbers of East Germans, including skilled workers, were escaping to the West through Berlin. This drained East Germany's economy and embarrassed the USSR, so the Wall was built to stop the flow of refugees and seal off the West.
In 1959 Castro led a revolution in Cuba and turned to the USSR. After the failed US-backed Bay of Pigs invasion (1961), Khrushchev placed Soviet nuclear missiles on Cuba — just 90 miles from the USA.
In October 1962 US spy planes found the missiles. President Kennedy ordered a naval "quarantine" (blockade). For thirteen days the world held its breath.
Khrushchev agreed to remove the missiles; in return the USA secretly promised to remove missiles from Turkey and not to invade Cuba.
Misconception check: Cuba brought the world the closest it ever came to nuclear war — but it was resolved by negotiation, not fighting. The scare led directly to the "hotline" and the first arms-control talks.
In 1968 the reformer Alexander Dubček tried to build "socialism with a human face" — more freedom of speech and less censorship. This hopeful period was called the Prague Spring.
In August 1968 Warsaw Pact tanks invaded and crushed the reforms. Afterwards the Brezhnev Doctrine declared the USSR's right to intervene in any communist country that strayed from the Soviet line.
Pattern spotting: Hungary 1956 and Czechoslovakia 1968 rhyme — reform in a satellite state, then Soviet tanks. Being able to compare them is exactly the skill Edexcel rewards.
Tap the events in chronological order, earliest first. Get one wrong and you start that step again.
The shock of Cuba pushed both sides towards détente — an easing of tension. Steps to 1972 included:
Range check: the topic ends in 1972 with SALT 1. Détente meant reduced tension, not friendship — the rivalry continued, just more cautiously.
Edexcel Paper 1 asks you to use and weigh sources. When you meet a source or interpretation, quickly ask:
Golden rule: a source being biased does not make it useless — it can still be very useful as evidence of what a side wanted people to believe. Judge usefulness against the question, not by "bias" alone.
Origins: Tehran 1943 · Yalta & Potsdam 1945 · atomic bomb · ideology
Develops 1945–49: Iron Curtain 1946 · Truman Doctrine & Marshall Plan 1947 · Berlin Blockade & Airlift 1948–49 · NATO 1949
Blocs & crises: Warsaw Pact 1955 · Hungary 1956 · Berlin Wall 1961 · Cuba 1962 · Czechoslovakia 1968
Détente to 1972: hotline 1963 · Test Ban 1963 · NPT 1968 · SALT 1 1972
Big ideas: the war stayed "cold"; Marshall Plan = economic containment; Cuba = closest to nuclear war
You've covered the whole Edexcel depth study — origins, development, crises and détente. Press Finish to see your score.
You've worked through A World Divided: Superpower Relations 1943-72 for Edexcel International GCSE History. 🎉
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