Feudalism is the economic and political system that developed in Europe during the middle ages which then ended due to the Bubonic Plague.
The Bubonic Plague is in other words the Black Death. The black death is a deadly contagious disease that killed millions of people.
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The black death was caused by the rats that carried fleas , which roamed the cities. It was also caused by the cities trash ,dead animals, and Human waste. The symptoms of the Bubonic Plague was fever, vomiting , fierce coughing and sneezing fits, egg sized swelling or bumps.
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The Bubonic Plague caused many to die. From Monarchy's to lords to Nobles to peasants. One by one they started to die.
Since they were all dying , peasants demanded more from their land owners due to the lack of workers because of all the deaths due to the Bubonic Plague.
Peasants gained power due to the Bubonic Plague. They obtained power by demanding for more their owners because there wasn't enough workers due to all the deaths. They obtained it because they had the opportunity to threaten the land owners if not payed enough. For example, they could threaten to go somewhere else to work if not given enough money.