What we are saying is :
1- There was no need to wipe out 620,000 Americans when slavery was on its way out
2- There was no need to create the precedent that DC could dictate to the states and violate their sovereignty.
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The idea slavery was on the way out is entirely false.
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Great Britain, Cuba, Brazil, and the Congo ended slavery peacefully in the nineteenth century by real statesmen in those countries.
"Some people have objected that the United States couldn't have bought the freedom of all the slaves, because that would have cost too much," Powell writes. "
But buying the freedom of the slaves was not more expensive than war. Nothing is more costly than war!" In fact, the North's financial costs of war alone would have been enough to purchase the freedom of all the slaves, and then ended slavery legally and constitutionally.
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