What led to the crusades? what positive and/or negative impacts were there because of the crusades ?
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First, the earliest military orders originated in Jerusalem in the wake of the First Crusade. A miltary order is a religious order in which members take traditional monastic vows—communal poverty, chastity, and obedience—but also commit to violence on behalf of the Christian faith. Well-known examples include the Knights Templar (officially endorsed in 1129), the Knights Hospitaller (confirmed by papal bull in 1113), and the Teutonic Knights (originated in the late twelfth century).The military orders represented a major theological and military development, and went on to play central roles in the formation of key political units that still exist today as nation-states.Second, crusading played a major role in European territorial expansion. The First Crusade resulted in the formation of the crusader states in the Levant (the eastern Mediterranean), which were initially governed, and in small part populated, by settlers from Europe.Third, the crusading movement impacted internal European development in a few important ways. The movement helped both to militarize the medieval western Church and to sustain criticism of that militarization. It arguably helped solidify the pope’s control over the Church and made certain financial innovations central to Church operations. And it both reflected and influenced devotional trends. For example, while there was some dedication to St. George from the early Middle Ages, the intensity of that devotion soared in Europe after he reportedly intervened miraculously at the Battle of Antioch in 1098, during the First Crusade.Fourth, the crusading movement has left an imprint on the world as a whole. For example, many of the national flags of Europe incorporate a cross. In addition,  many images of crusaders in our popular culture are indebted to the nineteenth century. Some in that century, like the novelist Sir Walter Scott, portrayed crusaders as brave and glamorous yet backward and unenlightened; simultaneously, they depicted Muslims as heroic, intelligent, and liberal. Others more wholeheartedly romanticized crusading.Sometimes the European influence was more diffuse. Modern crusading histories in the Islamic world began to be written in the 1890s, when the Ottoman Empire was in crisis. After the Ottomans, some Arab Nationalists interpreted nineteenth-century imperialism as crusading, and thus linked their efforts to end imperial rule with the efforts of Muslims to resist crusading in previous centuries. It would be reassuring to believe that nobody in the West has provided grounds for such beliefs, but it would not be true. Sadly, the effects of the crusading movement—at least, as it is now remembered and reimagined—seem to be still unfolding.