The Crusades changed the medieval world by implementing new political, social, and economic changes and the beneficial events that were caused by them. The relationships that were created between each of the three crusades and the places that were negatively and positively affected were also major parts of the changes the Crusades had on the medieval world. After the Crusades ended, the most recent effect was the change of power between European countries. There has been an increase in the power of Venice, Genoa, and Pisa. “The Muslim world was itself divided into various Muslim sects and beset by political rivalries and competition between cities and regions.” (Source E) Religions also were largely impacted by the political rivalries the cities