In the present day and age, Is preserving the United States as one country and not letting states secede from the Union, worth fighting a civil war?

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Explanation:

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the noble might have thought that the system was far because they had lot of things and riches and the serf would have thought that the feudal system was un fair because of the way they were treated.

these civilizations were located around fertile rivers, where they could produce an abundance of crops