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Interestingly, do you know which invention made medieval civil wars far less common?
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Gunpowder
244 votes (23.1%)
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The printing press
416 votes (39.4%)
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Standing national armies
214 votes (20.3%)
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Double-entry bookkeeping
181 votes (17.2%)
Total votes: 1,055
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.