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Interestingly, do you know which invention made medieval civil wars far less common?
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Gunpowder
283 votes (23.2%)
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The printing press
461 votes (37.8%)
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Standing national armies
253 votes (20.7%)
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Double-entry bookkeeping
223 votes (18.3%)
Total votes: 1,220
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.