Every war has a story of cause and consequence cause and consequence behind it. This concept asks two questions: why did the fighting start, and what changed because of it?
IB examiners want you to notice that causes are rarely single. A war usually grows out of several factors — political, economic, social — that build up together, and some causes act over decades while others are the final spark.
Never say a war was inevitable: Historians avoid the word 'inevitable'. Conflicts happen because of choices made by real people in real conditions — leaders could often have chosen differently. Examiners reward you for showing a war was probable but not certain, or that it was partly intentional and partly the result of accidental escalation.
- Long-term causes — deep tensions that build for years, like rival alliances or unresolved land disputes
- Short-term causes — the trigger event that turns tension into war
- Historical actors — the leaders, generals and ordinary people whose decisions shaped events
- Conditions — the circumstances (economic, political, social) those actors were operating within
Europe — First World War (1914–18)
- Long-term causes: rival alliance blocs, an arms race, and competition for colonies
- Short-term trigger: the assassination of Archduke Franz Ferdinand in Sarajevo, June 1914
- Consequence: over 16 million dead, empires collapsed (Russian, Ottoman, Austro-Hungarian, German), and the harsh Treaty of Versailles helped cause a second war 21 years later
Americas — Mexican Revolution (1910–20)
- Long-term causes: huge inequality in land ownership under dictator Porfirio Díaz, and a landless peasant class
- Short-term trigger: Francisco Madero's call to arms against Díaz's rigged 1910 election
- Consequence: roughly 1 million dead, but land reform and a new 1917 constitution reshaped Mexican society for decades
Notice the pattern: both wars combined slow-building tension with a sudden trigger, and both produced consequences far bigger than anyone expected in year one. That comparison — same concept, two regions — is exactly what Paper 2 rewards.
Naming the concept scores marks: In your answer, actually write the words 'cause and consequence'. Examiners are checking that you understand the concept, not just that you know the history.
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Continuity and change continuity and change asks what a conflict actually transformed, and what carried on regardless.
The key idea is that continuity and change happen at the same time, not one after the other. A war can bring rapid, dramatic change in some areas while older patterns quietly persist in others.
Vietnam War (1955–75) — Asia
Change: Vietnam was reunified under communist rule in 1975, ending decades of division. Continuity: rural peasant life and village structures in much of the countryside recovered much as before, once the fighting ended.
Rwandan genocide (1994) — Africa & the Middle East
Change: around 800,000 Tutsi and moderate Hutu were killed in roughly 100 days, and the RPF (Rwandan Patriotic Front) took power, ending Hutu-extremist rule. Continuity: the underlying Hutu-Tutsi identity categories, first hardened under Belgian colonial rule, kept shaping Rwandan politics afterwards.
Change is the headline; continuity is what the headline leaves out.
Perspectives perspectives is the concept examiners love to test because the same war looks completely different depending on who is describing it.
- Combatants — soldiers often stress duty, fear, and the day-to-day experience of fighting
- Civilians — focus on survival, loss, displacement and disrupted daily life
- Victors — tend to frame the war as necessary and justified
- Later historians — use hindsight and evidence unavailable at the time, and often revise earlier judgements
Weigh perspectives, don't just list them: A strong answer doesn't just say 'soldiers and civilians saw it differently'. It explains WHY their views differ (different information, different stakes, different timing) and tests which claims are best supported by evidence. For example, official Vietnam War-era U.S. government reports of steady progress clashed sharply with journalists' and soldiers' on-the-ground accounts — a gap historians now call the 'credibility gap'.
During the Rwandan genocide, the perpetrators' propaganda (like Radio Télévision Libre des Mille Collines) described Tutsi as an existential threat, while survivor testimony and later UN and historian investigations reveal a planned, organised campaign — very different pictures of the same hundred days.
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Significance significance asks which conflicts, or which experiences within a conflict, matter most — and why we should study them at all.
Significance isn't fixed. It's a judgement historians make, based on evidence and on what they value. The same event can be judged significant for different reasons.
- Power — did the event shift who holds political or military power?
- Impact — how many people were affected, and how deeply?
- What it reveals — does the event expose something important about how a society or system worked, even if the event itself was small-scale?
| Example | Region | Why judged significant |
|---|---|---|
| First World War | Europe | Redrew the map of Europe and the Middle East, ended four empires, and its peace settlement helped cause the Second World War — huge power and impact |
| Rwandan genocide | Africa & the Middle East | Small in territory but reveals how colonial-era identity categories and international inaction can produce mass atrocity — significant for what it reveals |
| Vietnam War | Asia & Oceania | Reshaped Cold War strategy, cost around 2–3 million lives, and changed U.S. public trust in government — power and impact |
| Mexican Revolution | Americas | First major social revolution of the 20th century; its land reforms and 1917 constitution influenced later Latin American movements — impact and what it reveals about inequality |
The same conflict, two different 'most significant' claims: A historian focused on military history might call the Battle of Verdun (1916) the most significant moment of the First World War, because of its scale and strategic cost. A historian focused on social history might instead point to the war's effect on women's employment and the vote, because it reveals long-term change in society. Both are valid — significance depends on the lens you choose, and a good answer says so.
When you argue significance in an exam, always justify your judgement with evidence — never just assert that something 'was important'.