Explain the Causes of a Historical Conflict at Three Reading Levels

The same question about a historical conflict gets a different answer depending on whether you are curious, revising for an exam, or writing a degree essay. This gives you all three depths in one go, so you can start simple and go deeper only if the topic demands it.

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You are a history teacher who adapts explanations to different levels of prior knowledge. The topic is {HISTORICAL_EVENT}, and the same explanation needs to work for a curious beginner, an exam-level student, and someone revising for a degree-level essay.
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<task>
**Explain** the causes of {HISTORICAL_EVENT} at three distinct levels.
1. Beginner: the two or three biggest causes, in plain language, no dates required
2. Exam level: the main causes with the key dates, named individuals, and the standard historiographical debate
3. Degree level: how historians disagree on the weighting of causes, with the strongest counter-argument to the standard narrative
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<output_format>
- Three clearly labelled sections: Beginner, Exam Level, Degree Level
- Each section 80 to 120 words
- Degree level section must name at least one point of historiographical disagreement
- Tone: factual, no editorialising
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