In simple terms
A friendly intro before the formal notes — no formulas yet.
The War Domino Effect
Wars don't happen in a vacuum. They are the result of a chain of causes and, in turn, create their own chain of effects that shape the world. Your task as a historian is to analyse and compare how these chains of dominoes fell in different conflicts.
Imagine you're asked to compare two very different parties: a small, formal dinner party and a massive, outdoor music festival. To analyse them properly, you wouldn't just describe one then the other. You'd compare their 'causes' (why were they held?), their 'methods' (the planning, the guests, the location), and their 'effects' (a clean house vs. a muddy field, new friendships, noise complaints). In history, you do the same with wars, comparing their causes and effects thematically to explain why they were different and what their legacies were.
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Deconstruct the Question: First, identify the command term (e.g., 'compare and contrast', 'evaluate') and the specific focus (e.g., 'economic causes', 'social effects'). This is your roadmap.
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Select Case Studies: Choose two appropriate wars you have studied in depth from two different IB regions (e.g., World War I in Europe and the Vietnam War in Asia).
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Structure Your Argument: Plan a thematic, integrated structure. For each theme (e.g., nationalism, economic impact), analyse both wars within the same paragraph, highlighting similarities and differences.
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Synthesise and Conclude: Use specific historical evidence and mention different historical interpretations (historiography) to support your analysis. Your conclusion must directly answer the question by summarising your comparative findings.
Explore the concept
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Key formulas
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Full topic notes
Formal explanation with the rigour you need for the exam.
Understanding the Causes of War: A Framework
Historians rarely attribute war to a single cause. Instead, they use a framework to categorise the various factors that lead to conflict. This helps to create a structured and analytical explanation, moving beyond simple narration. The most common framework is to distinguish between long-term, short-term, and immediate causes.
Long-term causes: Deep-rooted issues that create a tense atmosphere over many years or decades. Examples include Militarism, Alliances, Imperialism, and Nationalism (MAIN) before World War I.
Short-term causes: Specific events in the years or months leading up to war that escalate tensions. Examples include the Moroccan Crises (1905, 1911) or the Balkan Wars (1912-13) before WWI.
Immediate causes (Triggers): The final spark that ignites the conflict. The trigger is often a relatively minor event that, in the context of long- and short-term tensions, has massive consequences. The classic example is the assassination of Archduke Franz Ferdinand in Sarajevo in June 1914.
Analysing the Effects of War
The consequences of war are vast and complex, touching every aspect of society. To manage this complexity, you should categorise effects into three main areas: political, economic, and social. It is crucial to remember that effects are not uniform; a single war can have very different consequences for the victors and the vanquished, and for different classes or groups within the same country.
Structuring a Comparative Essay
For Paper 2, a thematic (or integrated) structure is far superior to a block (or serial) structure. A block structure describes War A first, then War B, with a brief comparison at the end. This is descriptive and scores poorly. A thematic structure organises paragraphs around key themes (e.g., nationalism, economic effects), discussing both wars and explicitly comparing them within each paragraph. This demonstrates true analysis.
High-Scoring Essay = (Clear Thesis) + Thematic Paragraphs × (Point + Evidence A + Evidence B + Comparative Analysis) + (Historiography) + (Strong Conclusion)
Worked examples
See the formulas applied — reveal one step at a time, like the exam.
"Compare and contrast the economic and social effects of two 20th-century wars, each chosen from a different region." [15 marks]
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Economic Effects (Contrast): Compare the nature of economic mobilisation and impact. For WWI, Britain and Germany implemented 'total war' economies, taking on massive national debt but also spurring industrial innovation. Britain lost its status as the world's primary creditor to the US. For the Vietnam War, the US pursued a 'guns and butter' policy, avoiding full economic mobilisation, which led to high inflation. In contrast, Vietnam suffered the complete destruction of its agricultural economy and infrastructure due to bombing and chemical warfare (Agent Orange).
"Evaluate the role of nationalism in causing two 20th-century wars, each chosen from a different region." [15 marks]
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Theme 1: Aggressive/Expansionist Nationalism. WWI was fuelled by this. Pan-Germanism sought to unite German-speaking peoples and expand German influence (Weltpolitik), while Pan-Slavism encouraged Russia to act as the protector of Slavic peoples like the Serbs. This created imperial rivalry. In contrast, the Chinese Civil War was not caused by expansionist nationalism, but by a struggle for internal control. The GMD's nationalism was focused on unifying China under its authority, not external expansion.
How it all connects
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Glossary
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Quick check
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Revision flashcards
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What is the difference between a 'cause' and a 'trigger' of a war?
A 'cause' is a long-term or short-term factor creating the conditions for war (e.g., imperialism, nationalism). A 'trigger' is the immediate event that sparks the conflict (e.g., the assassination of Archduke Franz Ferdinand).
Key takeaways
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Long-term causes: Deep-rooted issues that create a tense atmosphere over many years or decades. Examples include Militarism, Alliances, Imperialism, and Nationalism (MAIN) before World War I.
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Short-term causes: Specific events in the years or months leading up to war that escalate tensions. Examples include the Moroccan Crises (1905, 1911) or the Balkan Wars (1912-13) before WWI.
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Immediate causes (Triggers): The final spark that ignites the conflict. The trigger is often a relatively minor event that, in the context of long- and short-term tensions, has massive consequences. The classic example is the assassination of Archduke Franz Ferdinand in Sarajevo in June 1914.
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