The early modern trends in various regions of the world represented a shift away from medieval modes of organization, politically and economically. Feudalism declined in Europe, and Christians and Christendom saw the end of the Crusades and of religious unity under the Roman Catholic Church. The old order was destabilized by the Protestant Reformation, which caused a backlash that expanded the Inquisition and sparked the disastrous European Wars of Religion, which included the especially bloody Thirty Years' War and ended with the establishment of the modern international system in the Peace of Westphalia. Along with the European colonization of the Americas, this period also contained the Commercial Revolution and the Golden Age of Piracy.