Why the Southerners would be resentful with the
changes after the Civil War.

Because, all their slaves and manual labor were just taken from them, and the slaves they considered their property. Without the free labor many of the plantations could not support themselves, so families in the south were thrown into proverty.

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I hope this helps, and thanks! Brainliest please! ;)

for the points : )

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what are the options mate?

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not to be rude or anything but, nobody can really answer that if you don't add the options sorry if it came of rude uwu