Answer:
The Crusades did have positive effects on Europe, however. They began just as Europe was undergoing major economic and political changes, and the Crusades helped quicken the pace of those changes, contributing to the end of medieval Europe.
Step-by-step explanation:
Europeans had acquired a liking for goods imported from the Byzantine empire even before the Crusades. Trade increased as a result of the Crusades. Crusaders returning from the Middle East brought even more linens, spices, and fragrances to a broader market. Trade grew and flourished.
The Crusades further encouraged the growth of a money economy. To finance a journey to the Holy Land, nobles needed money.
Contacts with the Muslim world led Christians to realize that millions of people lived in regions they had never even known existed. Soon, a few curious Europeans left to explore far-off places such as India and China. etc...