How Crused war contributed to the demise of feudalism?

The Crusades contributed to the demise of feudalism by weakening the power of local lords and enhancing the authority of centralized monarchies. As nobles left to fight in the Holy Land, their lands were often managed by vassals or left untended, leading to a decline in local control. Additionally, the increased trade and interaction with other cultures during the Crusades helped stimulate a growing middle class, which further diminished the feudal system's rigid class structure. The financial burdens of war also pushed monarchs to seek new taxation methods, reducing reliance on feudal obligations.