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The Christians wanted Jersusalem or the holy land because that was where Jesus was buried. The problem was that the Turks and the Arabs already had control of it because of a previous Invasion. The Turks and Arabs didn't want to give up the land because they were Christians. Also, the Turks and Arabs started persecuting the Christians anywhere they could find them. This started the first Crusade.

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Holy land
The Holy Land is an area roughly located between the Jordan River and the Mediterranean Sea that also includes the Eastern Bank of the Jordan River. The Holy Land is known as Jerusalem. The Holy land is important because it is where many biblical events took place, and this is where the crusades fought the Muslims

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Muslims/Arabs wanted to expand by having Islam become the dominant religion of Europe. By conquering land in Europe the Arab army thought it would help the religion become dominant, although a loss in present day Spain ensured the dominance of Christianity in Europe.
The ottoman Turks captured Christians most important city Constantinople. To recapture the holy land the Christians crated the crusades and was able to take Jerusalem from Muslims then lost it and regained it back in 1229