Doesn't even make sense.
The Colonial Southerners did not doubt that all men were created equal in the sense of life, liberty and the pursuit of happiness, that is why they saw slavery as an evil
Remember Jefferson wanted to accuse the King of bringing slavery to the colonies?
Slavery thus, was never seen as contradicting the Declaration.
The Pre-Civil War South did reject the premise of all men were created equal, hence slavery became a positive good to be fought for.
Make sense now?