In Europe the feudalism pyramid formed and the political systems started. It started to weaken once the Bubonic Plague spread around the world. A cause of the decline of feudalism is the Bubonic Plague.
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The Bubonic Plague started in Europe and continued to spread to different areas around the world. ex: India & Central Asia
King Nobles Knights Peasants
Kings Commoners Knights Nobles
The Bubonic Plague was caused by when fleas jumped onto dead rats, then the fleas jumped onto humans. Humans spread the disease quickly.
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Since the Bubonic Plague started serfs abandoned feudal manors to live in the towns or the city.
For example, the Bubonic Plague shifted the power to the commoners from the nobles.
This is what the feudalism pyramid probably looked like when the Bubonic Plague hit.
Lastly, the Bubonic Plague contributed to the decline of feudalism by the power going to the commoners it let the leftover workers refuse to work & demand more money & rights.