Key Idea: Topic 17.3 is about the Cold War turning into real crises — moments when the US and USSR pushed each other to the edge without ever fighting directly. It covers Berlin (blockade in 1948–49, Wall in 1961), the hot proxy wars and standoffs in Korea (1950–53) and Cuba (1962), and the USSR crushing reform in its own bloc in Hungary (1956) and Czechoslovakia (1968). The thread running through all of them: two superpowers testing nerve, and neither willing to lose face.
🧱 17.3.1 — The two Berlin crises
When Germany lost the war in 1945, the winners split it — and its capital, Berlin — into four zones for the USA, Britain, France and the USSR. The catch was that Berlin sat deep inside the Soviet zone, so the free Western half was an island surrounded by communist land.
The first crisis (1948–49) came when the West merged its zones and launched a new currency, signalling a separate capitalist West Germany. Stalin panicked and blockaded West Berlin — cutting every road and railway to starve it out. The West answered with an airlift, flying in food and coal for nearly a year until Stalin backed down. The second crisis came in 1958–61: as East Germans fled through open Berlin, the communist East built the Berlin Wall overnight in 1961 to stop the escapes, and US and Soviet tanks faced off at Checkpoint Charlie before both quietly pulled back.
- West Berlin was surrounded — 160 km inside the Soviet zone, reachable only by air and land routes Stalin could squeeze.
- Blockade & airlift (1948–49) — Stalin cut land routes; the West supplied the city by air and won without firing a shot.
- Germany splits (1949) — the crisis created two states: the FRG (West) and GDR (East).
- The Wall (1961) — built to stop ~3 million refugees fleeing West; standoff at Checkpoint Charlie.
- Kennedy defended West Berlin firmly but accepted the Wall — 'a lot better than a war'.
🔥 17.3.2 — Korea and Cuba: the Cold War gets hot
Korea (1950–53) turned the Cold War hot for the first time. Korea had been split at the 38th parallel — communist North (backed by the USSR) versus anti-communist South (backed by the US). In June 1950 the North invaded, so the US and UN struck back under General MacArthur; then China joined in, and the fighting froze back at the 38th parallel, ending in a 1953 armistice — a ceasefire, not a peace treaty.
Cuba (1962) brought the world closest to nuclear war. After Castro's revolution turned Cuba communist, Khrushchev secretly placed nuclear missiles there, 90 miles from Florida. Kennedy responded with a naval blockade (a 'quarantine'), and for thirteen days the world held its breath — until a deal: the USSR removed its missiles, the US promised never to invade Cuba, and secretly agreed to pull US missiles out of Turkey.
- 38th parallel — the line dividing Korea; the war ended almost exactly where it began.
- Containment — the US policy of stopping communism spreading, now applied in Asia, not just Europe.
- Proxy war — superpowers backed opposite sides instead of fighting each other directly.
- Bay of Pigs (1961) — the failed US-backed invasion that pushed Castro toward Moscow.
- Brinkmanship — Cuba's thirteen days are the textbook case of going to the edge of war; it led to the Washington–Moscow hotline and a step toward détente.
🚜 17.3.3 — Crushing reform: Hungary and Czechoslovakia
The USSR controlled a ring of Eastern European states, the Soviet bloc, tied together by the Warsaw Pact military alliance. When one tried to reform or break away, Moscow answered with tanks. Hungary (1956) came first: after Khrushchev's de-Stalinization raised hopes, an uprising put reformer Imre Nagy in charge. His fatal step was announcing Hungary would leave the Warsaw Pact — so Soviet tanks invaded, killed around 2,500, and installed the loyal János Kádár.
Czechoslovakia (1968) repeated the pattern from the top. Party leader Alexander Dubček launched the Prague Spring — 'socialism with a human face', with press freedom and reform, while staying in the Warsaw Pact. Fearing it would spread, Brezhnev sent ~500,000 Warsaw Pact troops in August 1968, reversed the reforms and installed Gustáv Husák. Brezhnev then justified it with the Brezhnev Doctrine: the USSR's claimed right to intervene anywhere communism was threatened. The West condemned both — but never sent troops.
- Hungary 1956 — Nagy · tried to quit the Warsaw Pact · crushed · Kádár installed.
- Czechoslovakia 1968 — Dubček · 'socialism with a human face' (Prague Spring) · Husák installed.
- Warsaw Pact — the USSR's military alliance; leaving it was Moscow's red line.
- Brezhnev Doctrine (1968) — the USSR's right to invade any bloc state to protect communism.
- West condemned but did not act — Eastern Europe was accepted as the Soviet 'sphere of influence'.
✍️ Exam-ready answers
Compare and contrast the causes and consequences of two Cold War crises.
🔒 Model answer plan
See the mark-by-mark plan — for / against / judgement, with marking guidance — in study mode.
Examine the reasons why the USSR intervened in Eastern Europe (e.g. Hungary 1956 and Czechoslovakia 1968).
🔒 Model answer plan
See the mark-by-mark plan — for / against / judgement, with marking guidance — in study mode.
🎯 One-glance recall
Berlin — twice a flashpoint Because West Berlin sat inside the Soviet zone. Blockade & airlift (1948–49) split Germany into FRG and GDR; the Wall (1961) stopped the refugee flow after a standoff at Checkpoint Charlie.
Korea — the Cold War goes hot and global North invaded South (1950) across the 38th parallel; UN/US pushed back, China entered, and it ended in a 1953 armistice (a ceasefire, not peace) at the same line. Containment spread to Asia.
Cuba — thirteen days on the brink Soviet missiles 90 miles from the US triggered a 1962 blockade. The deal — missiles out, US no-invasion pledge, secret Turkey withdrawal — brought the hotline and a step toward détente. Classic brinkmanship.
Hungary & Czechoslovakia — reform crushed Nagy tried to leave the Warsaw Pact (1956); Dubček's Prague Spring (1968) frightened Moscow. Both were crushed by tanks and loyal leaders installed, formalised as the Brezhnev Doctrine. The West condemned but never intervened.