What principle did South Carolina use to justify secession at the start of the Civil War?

The declaration stated the primary reasoning behind South Carolina's declaring of secession from the U.S., which was described as "increasing hostility on the part of the non-slaveholding States to the Institution of Slavery".

Explanation:

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the answer that best explains what happened to george washington at fort necessity, pennsylvania is : washington was attacked by the french but was able to negotiate with them to peacefully end fighting. the battle took place on july 3, 1754. the battle is considered as being the start of the french and indian war.