Blitzkrieg. It was a huge strategy that involved air attacks, tanks etc.
The crusades enabled Europe to come in contact with the Islamic World. Yes it did technically cause the renaissance, the crusades didn't just enable contact but interactions.
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Answer:The Civil War ended slavery and devastated the southern economy because everything they fought for was lost and they lost a lot of materials and men fighting for a hopeless cause they knew they couldn't win and it also acted as a catalyst to transform America into a complex modern industrial society of capital, technology, national organizations, and large corporations.
