How did the crusades help end the middle ages

its main object was the establishment of "settlement houses" in poor urban areas, in which volunteer middle-class "settlement workers" would live, hoping to share knowledge and culture with, and alleviate the poverty of, their low-income neighbors.

there is not all the infomation needed to answer this question.   we need the who was going, or we need to know what islands you are talking about.

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