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The big idea: Wars do not stop when the fighting stops. This micro gives you a checklist of the ways a war changes the world — the categories you use to plan almost any Paper 2 essay on effects.
Paper 2 loves the word effects. An essay might ask you to examine the effects of a war, or to judge how far a war changed a country.
The danger is writing a story of what happened. Examiners want you to sort the effects into clear themes and then weigh them.
- Peacemaking — the successes and failures of the peace settlements and the international bodies set up to keep the peace
- Territorial — borders redrawn, new states born, and the balance of power shifting between the great powers
- Political — regime change, revolution, and new systems of government
- Economic — the cost of war, debt, reparations, reconstruction and economic dislocation
- Social — how everyday life changed, including the changing role of women
- Human cost — the number of dead and wounded, and the split between military and civilian losses
A memory hook: P-T-P-E-S-H: Peacemaking · Territorial · Political · Economic · Social · Human cost. Run through these six and you will rarely miss a major effect in an essay.
Two more habits make these categories powerful. First, split effects into short-term and long-term.
Second, notice that effects are linked. Harsh reparations caused economic misery, which then fed the political rise of extreme parties — so your themes talk to each other.
The first thing many wars produce is a peace settlement — the deal that officially ends the fighting. Historians judge these deals by whether they lasted.
Successes and failures of peacemaking: A peace can succeed by ending conflict fairly and building lasting cooperation. It can fail by being so harsh or so weak that it plants the seeds of the next war.
The classic failure is the Treaty of Versailles (1919). Many Germans saw it as a humiliating diktat, and its resentments helped Hitler rise.
Peacemaking also means the international organisations built to stop future wars. After 1919 came the League of Nations; after 1945 came the United Nations.
League of Nations (1920) — mostly failed
- The USA never joined, which left it weak from the start
- It had no army of its own to enforce decisions
- It could not stop aggression in Manchuria, Abyssinia or the Rhineland
- By 1939 the world was at war again
United Nations (1945) — more durable
- The great powers, including the USA and USSR, all joined
- A Security Council could authorise real action
- It survived the whole Cold War and still exists today
- Yet the veto often left it deadlocked
Next come territorial changes. Wars redraw the map — borders move, empires break up, and brand-new states appear.
New states from old empires: After the First World War four empires collapsed — German, Russian, Austro-Hungarian and Ottoman.
Out of the wreckage came new countries such as Poland, Czechoslovakia and Yugoslavia. This is also a shift in the balance of power — the rough sharing of strength among the leading states.
Territory and power go together. When Germany was carved up after 1945, the real winners were two new superpowers — the USA and the USSR.
- Regime change — a war can topple the government or ruler in power
- Revolution — defeat and hardship can spark a mass uprising that overthrows the whole system
- New systems of government — an old order is replaced by a new type of state, such as a republic or a communist regime
War as the midwife of revolution: The strain of the First World War helped cause the Russian Revolution of 1917, which ended the tsar and created the world's first communist state. War does not just change borders — it can change the very kind of government a country has.
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The last three categories are about people and money — how war drains an economy, reshapes society, and takes lives.
Cost and debt
War is hugely expensive. Countries borrow heavily to pay for it, so they end the war deep in debt — Britain owed vast sums to the USA after 1918.
Reparations
The losing side is often forced to pay the winners. Germany was charged huge reparations at Versailles, which crippled its economy.
Dislocation
War throws an economy out of shape. Factories built for weapons must switch back to peacetime goods, prices soar, and trade collapses — this is economic dislocation.
Reconstruction
Bombed cities, roads and factories must be rebuilt. After 1945 the US-funded Marshall Plan poured money into rebuilding Western Europe.
Cost → Debt → Reparations → Dislocation → Reconstruction: follow the money from war to peace.
Now the social effects — the changes to how ordinary people live. War can break down old class barriers and shift what jobs people do.
The changing role of women: This is the social effect examiners ask about most. During both world wars, with millions of men at the front, women moved into factories, farms and offices in huge numbers.
Many historians link this wartime work to women winning the vote — in Britain in 1918, in Germany in 1919, and in the USA in 1920.
Don't overstate the change: Be balanced. After both wars, many women were pushed back into the home so returning soldiers could have their jobs.
So the change was real but often partial and temporary — a great point to argue in an essay rather than simply claiming 'war freed women'.
Finally, the human cost — the dead and the wounded. Examiners want you to know the scale and to draw one key distinction.
Military vs civilian casualties: Military casualties are soldiers killed or wounded. Civilian casualties are ordinary people — from bombing, hunger, disease or genocide.
The pattern of the 20th century is stark: wars grew more deadly for civilians, because of aerial bombing and the deliberate targeting of populations.
| War | Rough total deaths | Key point about civilians |
|---|---|---|
| First World War | About 17 million | Mostly military; a huge soldier death toll in the trenches |
| Second World War | About 60 million or more | Mostly civilian — bombing, the Holocaust, famine and disease |
Use casualties as evidence, not decoration: Rough figures are fine — say 'around 60 million' for WWII. The analysis mark comes from the point that civilian deaths overtook military deaths, showing how total war had become.