What does the origin of many of the routes demonstrate about europe and the crusades?

The crusades initially happened in 1095 proclaimed by Pope Urban II. They were Christian military expeditions from Europe ,that aimed to liberate the Holy Land and Jerusalem from Muslim rule. Although its main objective was to regain Christian territories, it was also motivated by economic objectives with the opening of new markets along the expedition route.

explanation:

the addition to geographic boundaries that might have  kept the people of the huang river civilization from traveling to far distance region is that they had learned about the other river valley civilizations but feared contact would bring invasion.

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