Final answer:
The Crusades had a major effect on Europe, resulting in increased trade with the Islamic World and the establishment of trade centers.
Step-by-step explanation:
A major effect of the Crusades on Europe was increased trade with the Islamic World. As a result of the Crusades, European merchants developed new trade routes to the East, allowing for the exchange of goods, ideas, and technologies between Europe and the Islamic World. This led to a period of economic growth and the establishment of trade centers, such as Venice and Genoa, which became wealthy and powerful as a result of their involvement in this trade.
Economic growth and the establishment of trade centers were significant outcomes of the Crusades, transforming Europe's economic landscape and facilitating cultural exchange.
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