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Effects of the Crusades. Although the crusades failed to capture Jerusalem, they had several major impacts on Western Europe. They increased the authority of the king: Sometimes nobles died in battle without leaving an heir in which case the king got their land. Kings passed taxes to pay for the crusades.

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The Europeans learned about new concepts in math as well as a new numbering system, called Hindu Arabic Numerals, that we still use today. They gained access to new medical knowledge and other ideas as well. The Crusades also opened up many new trade possibilities with goods that Europeans never had access to before.