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Interestingly, do you know which invention made medieval civil wars far less common?
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Gunpowder
129 votes (28.1%)
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The printing press
195 votes (42.5%)
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Standing national armies
68 votes (14.8%)
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Double-entry bookkeeping
67 votes (14.6%)
Total votes: 459
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.