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The big idea: After 1945 the world split into two rival camps — one led by the USA, one by the USSR.
Each had its own alliance, its own economic system, and its own beliefs. This is the bipolar order that shaped the whole Cold War.
In 1945 the USA and the USSR had just won the Second World War together. Within a few years they were bitter rivals.
They never fought each other directly — a war with nuclear weapons would have destroyed both. Instead they competed everywhere else: in alliances, in ideas, and in far-off countries.
The Western bloc (USA-led)
- Military alliance — NATO, formed in 1949 to defend Western Europe
- Economic system — capitalism: private business and free markets
- Politics — democracy with elections and many parties (in most members)
- Belief — freedom, private property and the right to trade
The Eastern bloc (USSR-led)
- Military alliance — the Warsaw Pact, formed in 1955 to bind Eastern Europe to Moscow
- Economic system — communism: the state owns industry and plans the economy
- Politics — one-party rule by the Communist Party, no free elections
- Belief — equality, and that capitalism should be swept away
- NATO — the North Atlantic Treaty Organization, the West's military alliance led by the USA
- Warsaw Pact — the Soviet military alliance of Eastern European communist states, set up in 1955
- Capitalism — an economy where private owners run business for profit
- Communism — a system where the state owns the economy and aims for equality
Two of everything: Two superpowers, two alliances, two economic systems, two sets of beliefs. When you picture the Cold War, picture a world divided down the middle.
Each superpower built a sphere of influence — a group of countries it controlled or strongly guided.
The dividing line ran through the middle of Europe. Winston Churchill called it an Iron Curtain in a famous 1946 speech.
Soviet control in the East
- Set up communist governments across Eastern Europe: Poland, Hungary, Czechoslovakia, East Germany and more
- Kept them loyal by force — Soviet tanks crushed a rising in Hungary in 1956 and reforms in Czechoslovakia in 1968
- These states were satellites — supposedly independent, but taking orders from Moscow
US influence in the West and beyond
- Gave huge aid to rebuild Western Europe through the Marshall Plan from 1948
- Influence rested more on money, trade and alliances than direct control
- Reached worldwide — backing friendly governments in Asia, the Middle East and Latin America
The role of ideology: Ideology sat at the heart of the rivalry.
Each side genuinely believed its system was best for the world — and that the other side was dangerous. This made compromise hard: it felt like good against evil, not just country against country.
Self-justification
Each superpower told its people it was the defender, never the aggressor. The USA said it protected freedom; the USSR said it protected the workers.
Painting the enemy
American propaganda warned of a communist plot to take over the world. Soviet propaganda attacked capitalism as greedy and unfair.
Winning hearts abroad
Both sides used radio, film, sport and even space missions to prove their way of life was better and win support around the globe.
Ideology gave the Cold War its heat; propaganda spread it to the world.
Propaganda in action: When the USSR launched the first satellite, Sputnik, in 1957, it was a propaganda triumph. It suggested communism could out-invent capitalism — and it frightened the Americans into pouring money into science and space.
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The Cold War did not stay in Europe. It spread across the whole planet.
Because the two superpowers dared not fight directly, they backed opposite sides in other countries' wars. These are called proxy wars.
- Korea (1950–53) — the US-led side fought the North, backed by the USSR and China
- Vietnam (1955–75) — the USA fought communist forces supported by the USSR and China
- Cuba — the USSR gained a communist ally on America's doorstep from 1959
- Afghanistan (1979–89) — the USSR invaded, and the USA armed the fighters resisting it
Leaders mattered: The personalities and choices of individual leaders could raise or lower the tension — sometimes overnight.
| Leader | Country | Their effect on the rivalry |
|---|---|---|
| Stalin | USSR | Suspicious and ruthless; tightened Soviet grip on Eastern Europe |
| Khrushchev | USSR | Bold and unpredictable; provoked the Cuban crisis, then sought calmer relations |
| Kennedy | USA | Stood firm in the Cuban crisis but opened talks afterward |
| Reagan | USA | Talked tough early, then negotiated deep arms cuts with Gorbachev |
| Gorbachev | USSR | Reform-minded; his openness helped end the Cold War peacefully |
The 1962 Cuban Missile Crisis: In 1962 the USSR placed nuclear missiles in Cuba. For thirteen days the world stood on the edge of nuclear war.
Kennedy and Khrushchev managed the crisis carefully and stepped back. It showed how personal decisions at the top could decide the fate of millions.
The terror of that crisis pushed both sides towards détente — a deliberate easing of tension, especially in the 1970s.
Confrontation
Blockades, arms races and tough speeches, as each side tried to look strong and scare the other.
Crisis management
In moments like Cuba, leaders used back-channel talks and careful signals to avoid tipping into real war.
Negotiation
Through summits and arms-control deals such as SALT in the 1970s, the superpowers agreed limits and built a little trust.
The Cold War swung between confrontation, crisis and cautious talks — never one setting for long.