Free preview
This is the free notes preview
You're reading the free notes. In My Learning the same topic also comes with:
- FlashcardsLock in vocabulary and key terms with spaced repetition.
- Practice questionsAnswer exam-style questions and get instant AI marking.
- Mock exams & past-paper vaultSit full mocks and see exactly how examiners award marks.
- Personalised study planA daily plan built around your exam date and weak areas.
The big idea: Korea turned the Cold War hot. For the first time, the superpowers fought a real war — but through others, in Asia, without firing at each other directly.
After 1945 Korea was split in two along a line called the 38th parallel. The Soviet Union backed a communist state in the North under Kim Il-sung.
The United States backed an anti-communist state in the South under Syngman Rhee.
The split was meant to be temporary, but neither side would give way. Two hostile Koreas now faced each other across the border.
In June 1950 the North invaded the South, hoping to unite Korea by force under communism.
Why did war break out?: The invasion was not just a local quarrel. To President Truman it looked like communism spreading, exactly as his policy of containment warned.
Stalin had quietly approved Kim's plan, so the US saw a global communist push that had to be stopped.
1 · The North invades
In June 1950 North Korean troops poured across the 38th parallel and almost overran the whole South within weeks.
2 · The UN and US strike back
The UN (with the USSR absent from the vote) sent a mostly-American force under General MacArthur. A bold landing at Inchon pushed the North back.
3 · China enters
When UN troops neared China's border, China sent hundreds of thousands of soldiers. They drove the UN back to roughly the 38th parallel.
4 · Stalemate and armistice
The fighting froze near the original border. In 1953 an armistice (a ceasefire, not a peace treaty) ended the fighting with Korea still divided.
Invade → Push back → China in → Stalemate. Back where it started, at the 38th parallel.
The key twist to remember: The war ended almost exactly where it began — at the 38th parallel. Millions died, yet the border barely moved. That is why Korea is often called a bloody stalemate.
Korea changed how both sides fought the Cold War. It proved the two superpowers would clash far beyond Europe.
From now on, the whole world was a possible battleground.
- Containment went global — the US now fought communism in Asia, not just Europe. The Cold War was no longer only a European quarrel.
- The Cold War militarised — the US tripled its defence spending and built up NATO. Both sides prepared for a long armed struggle.
- Korea stayed divided — no side won, no reunification happened. North and South remain separate to this day.
- China rose as a power — by fighting the US to a standstill, communist China proved it was a major force in Asia.
The lesson each side learned: The superpowers saw they could fight through proxy wars — arming others rather than each other. This kept the peace between them, but spread war elsewhere.
What Korea changed
- Containment applied in Asia for the first time
- Huge rise in US and NATO military spending
- China recognised as a serious Cold War player
- A model for future proxy wars, like Vietnam
What Korea did NOT change
- Korea stayed split at the 38th parallel
- The superpowers never fought each other directly
- No peace treaty was ever signed
- The basic tension between the blocs continued
Don't confuse armistice with peace: The 1953 armistice was only a ceasefire. No formal peace treaty was ever signed, so technically the two Koreas are still at war today. Examiners love this detail.
Practice with real exam questions
Answer exam-style questions and get AI feedback that shows you exactly what examiners want to see in a full-marks response.
The big idea: For thirteen days in October 1962, the world came closer to nuclear war than ever before — over Soviet missiles on a small island 90 miles from Florida.
In 1959 Fidel Castro led a revolution in Cuba and pushed out its US-friendly ruler.
When Castro turned to the Soviet Union for help, the US suddenly had a communist ally sitting right on its doorstep.
In 1961 the US backed a failed invasion by Cuban exiles, the Bay of Pigs.
The fiasco humiliated the US and pushed Castro even closer to Moscow — and made Cuba fear a real US attack.
Why did the Soviets put missiles in Cuba?: In 1962 Khrushchev secretly shipped nuclear missiles to Cuba. This defended his ally Castro — and it let the USSR aim missiles at the US up close, just as US missiles already sat in Turkey near the USSR.
When a US spy plane photographed the missile sites, the crisis exploded.
1 · Discovery
A US U-2 spy plane photographed Soviet missile bases being built in Cuba. President Kennedy learned the US was in nuclear range.
2 · The blockade
Kennedy ordered a naval 'quarantine' — a blockade to stop more missiles reaching Cuba, without calling it an act of war.
3 · Thirteen days on the brink
Soviet ships sailed towards the blockade as both sides went to high alert. This tense standoff is called brinkmanship.
4 · The deal
Kennedy and Khrushchev negotiated by letter. The Soviet ships turned back and a secret deal was reached.
Spot them → Blockade → Standoff → Deal. Thirteen days, no shots fired.
The secret deal that ended it: Khrushchev publicly agreed to remove the missiles from Cuba, in return for a US promise never to invade Cuba.
Secretly, Kennedy also agreed to withdraw US missiles from Turkey — so both leaders could claim they had not simply backed down.
Spot it: {{brinkmanship|pushing a dangerous situation to the edge to force the other side to back down}}: Cuba is the textbook example of brinkmanship — going to the very edge of war to make the other side blink first. Use this word in an essay and explain it.