There were many changes in Europe as a result of the crusades.Some of the most significant were the effects of feudalism.It made thousands of knights sell their land in order to raise money for the crusading expedition which lead to making the knights poor and weak.More knights and soldiers died as a result of private warfare which lead to making kings more powerful.
Other changes included social effects.The crusades offered an opportunity for romantic adventures. Contact with the cultures of the east provided a general refining influence. The Crusades were one of the principle fostering influences of chivalry, which meant saving a lady for your own life.
In my opinion the most important was commerce. They created a constant demand for men and supplies. It increased the number of ship building which lead to the expand of trade throughout the middle east, that is a important thing cause when they expand trade throughout the middle east it will increase the wealth of the cities.
