How did the Crusades change the economic system of Europe?

In Europe, the Crusades led to economic expansion; increased trade and use of money, which undermined serfdom and led to prosperity of northern Italian cities. They led to increased power of the monarchs, and, briefly, to increased power of the papacy.

i believe the answer is:

~b. the elastic clause gives the supreme court original jurisdiction in a limited number of cases.

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wait history, who want to talk about history, boring.