How did the crusades impact?

Answer 1

The advance of Islam into Europe by the Seljuk Turks, later the Ottoman Empire ended with the Crusades. Infighting among the various Muslims sects and empires stimulated by the Crusades and the Spanish Inquisition coupled with the prerequisites for an industrial revolution found in Britain denuded the Middle East of resources at a critical time of developement. In a sense the Crusades began the equivalent of the Dark Ages for Islamic empires.