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Interestingly, do you know which invention made medieval civil wars far less common?
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Gunpowder
249 votes (23.1%)
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The printing press
423 votes (39.2%)
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Standing national armies
219 votes (20.3%)
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Double-entry bookkeeping
187 votes (17.3%)
Total votes: 1,078
The answer is standing national armies.
Most people assume gunpowder changed everything. In reality, historians often argue that permanent state armies gradually removed military power from feudal nobles, making private wars much harder to wage.