Answer:
Pro: Feudalism saved the common men from the foreign invaders. By saving people from the clutches of invaders and plunders, it created a healthy society.
Con:
A disadvantage of feudalism is that Europe could not be united in the presence of rivalry, suspicion and war. The presence of the feudal system made it difficult for Europe to be united. With the absence of unity, no real sovereign states could be created in Europe.
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