What are some of the reasons why the Christian West attacked the Muslim East ?

The Catholic Church called for the Crusades to liberate the Holy Land and Jerusalem from Muslim rule, an unacceptable situation to the eyes of Christian Europe because Muslims were treated as infidels. The Vatican offered forgiveness of sins and eternal life to all those who participated in the holy war against the infidels. Beyond the religious motives, many European feudal lords and powerful kings saw a chance to conquer land, wealth and position in the Middle East, a material interest that was also a powerful drive of the Crusades.

Explanation:

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the right answer for the question that is being asked and shown above is that: "their policy of "divide and rule" pitted political groups against each other to keep any one group from becoming too powerful.  " the  participant in european imperialism is being described below is that  their policy of "divide and rule" pitted political groups against each other to keep any one group from becoming too powerful.