Answer :
Trade increased, and Europeans also returned with knowledge of flora, irrigation, and animal breeding.
What was the purpose of the Crusader states?
Early on in its history, each crusader state had a specific strategic objective. Edessa aspired to govern the Upper Euphrates valley, Jerusalem required unrestricted access to the Mediterranean, and Antioch planned to capture Cilicia and the area along the upper course of the Orontes River.
The things that Western Europeans carried back were lemons, apricots, sugar, silk, cotton, and cooking spices. Not all Crusaders returned home after defeating the Muslims.
Thus, Trade increased, and Europeans also returned with knowledge of flora.
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