Which event the bubonic plague of the crusades most contributed to the decline of feudalism in Europe?

The Bubonic Plague, particularly during the 14th century, significantly weakened the feudal system by drastically reducing the population of Europe, which created a labor shortage. This scarcity of workers empowered peasants to demand higher wages and better working conditions, leading to increased mobility and a decline in the traditional obligations of serfs to their lords. Additionally, the massive loss of life diminished the power of the nobility and disrupted the established social hierarchy, further contributing to the decline of feudalism.