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Interestingly, do you know which invention made medieval civil wars far less common?
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Gunpowder
126 votes (28.6%)
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The printing press
185 votes (42.0%)
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Standing national armies
64 votes (14.5%)
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Double-entry bookkeeping
65 votes (14.8%)
Total votes: 440
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.