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The big idea: The First World War did not just end in 1918 — it broke the old world apart. Four empires fell, new countries were born, millions were dead, and the peace treaties tried to rebuild everything at once.
When the guns finally stopped on 11 November 1918, Europe looked nothing like it had in 1914. Kings had lost their thrones and whole empires had vanished from the map.
Historians study these changes using an effects framework. It sorts the results of a war into clear headings.
This micro applies that framework to WWI. The five headings you must be able to discuss are peacemaking, territory, politics, economy and society, and the human cost.
Get these five into your head now — every Paper 2 essay on the effects of WWI is really asking you to weigh them against each other.
- Peacemaking — the 1919 Paris settlements, above all the Treaty of Versailles, and the new League of Nations
- Territorial — the collapse of four empires and a redrawn map of Central and Eastern Europe
- Political — the Russian Revolutions, fallen monarchies and new republics
- Economic and social — reparations, debts, inflation, and a changed role for women
- Human — around 9–10 million soldiers dead, millions of civilians, plus a deadly flu pandemic
Spot it: five effect headings: Peace · Territory · Politics · Economy/Society · Human cost. Almost any point you make about the aftermath of WWI fits one of these five — so plan your essay around them.
In 1919 the winning powers met in Paris to decide the terms of peace. The most important of the treaties they signed was the Treaty of Versailles, dealing with Germany.
Three men dominated the talks — known as the Big Three. Each wanted something different, so the final treaty was a messy compromise.
Georges Clemenceau (France)
France had been invaded and wrecked, so Clemenceau wanted Germany punished and made too weak to ever attack again. He pushed for harsh terms and heavy reparations.
Woodrow Wilson (USA)
The US President wanted a fair, lasting peace built on his Fourteen Points. His dream was a League of Nations to stop future wars.
David Lloyd George (Britain)
The British leader sat in the middle. He wanted Germany weakened but not crushed, because Britain still needed Germany as a trading partner and feared communism spreading.
Clemenceau CRUSH · Wilson FAIR · Lloyd George MIDDLE.
What the Treaty of Versailles did to Germany: Germany lost land, its army was capped at 100,000 men, and it lost its colonies.
Worst of all for Germans, Article 231 — the war-guilt clause — forced Germany to accept the blame for the war, which justified huge reparations (payments for war damage).
Wilson's greatest hope came true on paper — the League of Nations was founded in 1920. It was the first ever world body designed to settle disputes by talking, not fighting.
But the League was born weak. Three flaws crippled it from the start.
- No United States — America's Senate refused to join, so the League lost its most powerful member from day one
- No army — the League had no soldiers of its own and could only ask members to act, which they often refused to do
- The unanimity rule — big decisions needed every member to agree, so a single 'no' could block any action
A peace that stored up trouble: Many Germans saw Versailles as a humiliating Diktat — a dictated peace they were forced to sign. That bitterness would later help Hitler rise to power. A weak League could not stop him.
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The war did more than punish Germany — it destroyed empires. Four great empires collapsed: the German, the Austro-Hungarian, the Russian and the Ottoman.
Out of their ruins, a string of brand-new states appeared across Central and Eastern Europe.
The German Empire falls
The Kaiser fled in November 1918 and Germany became a republic — the fragile Weimar Republic that had to sign Versailles.
Austria-Hungary breaks up
This huge multi-national empire shattered into new states, giving rise to Austria, Hungary, Czechoslovakia and part of Yugoslavia.
The Russian Empire collapses
The Tsar was overthrown in 1917. New states like Poland, Finland and the Baltic countries broke away from Russian control.
The Ottoman Empire ends
The old Turkish empire was carved up in the Middle East, with Britain and France taking control of new territories called mandates.
Self-determination on the map: Wilson's idea of self-determination shaped the new borders. New nations like Poland, Czechoslovakia and Yugoslavia appeared — though mixing many ethnic groups inside them stored up future conflict.
The biggest political shock came in Russia. In 1917 two revolutions swept the country: the first toppled the Tsar, and the second brought the communist Bolsheviks, led by Lenin, to power.
Russia became the world's first communist state. Across Europe, monarchies fell and new republics rose in their place.
Economic and social effects: The war left the winners in debt — Britain and France owed the USA huge sums — and left Germany owing reparations it could barely pay.
This fed inflation: prices spiralled out of control, most infamously in Germany in 1923, wiping out people's savings.
Society changed too, especially for women. With millions of men away fighting, women had filled the factories, farms and offices that kept nations running.
After the war, many countries rewarded that role by giving women the vote — Britain and Germany (1918) and the USA (1920) all moved toward female suffrage.
The human cost: Around 9–10 million soldiers were killed, and millions of civilians died from fighting, hunger and disease.
Then, as the war ended, the 1918–19 influenza pandemic ('Spanish flu') swept a weakened world and killed tens of millions more — in some estimates, more than the war itself.