Manufacturing is the answer
Answer: The first Crusade was successful for European leaders they were able to have some cities such as Jerusalem, Acre, Bethlehem, and Antioch. But after that things go wrong.
The political perspective was a failure.
Although they did not fully achieve their religious goal, the Crusades promoted major changes across Europe, such as the reopening of the Mediterranean to European shipping and trade. This made it possible to intensify trade between the West and the East, largely interrupted by Muslim expansion.
The Second Crusade was started in response to the fall of the County of Edessa in 1144 to the forces of Zengi.
