What were the causes of the crusades?

There were many causes of the crusades including political, economic, and religious factors. However, the crusades were a major conflict between European Christian forces and Muslim armies from Western Asia who fought for control of the Holy Lands that had importance to both Christians in Muslim. The control of these lands brought power, prestige, religious importance, and also economic gains to whichever force controlled these lands. 

The answer is william henry harrison pursued and defeated british forces retreating into canada.

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