How did the crusades lead to the decline of feudalism?

While fighting holy wars against the Turkish Muslims, the crusaders learnt the use of guns and gunpowder.

Explanation:

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The crusaders learned the use of guns and gunpowder.

zoom in on the bill of rights. the other side was just as divided: some antifederalists opposed the constitution only because it lacked a bill of rights, and others opposed it on other grounds and merely used the bill of rights as an excuse to campaign against it.