Factories sped up war production by allowing several products to be made at once, sometimes with mechanical mechanisms to increase production
You're answer would be letter choice B.
The fall of the Berlin wall.
Answer:
They promised to give conquered lands to the Crusaders, and then kept the land for themselves.
Explanation:
The Byzantine was very possessive over the captured, or conquered land, so they lied and kept it for themselves instead of the Crusaders.
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