So you admit that the Southern actions were a rebellion?
If the British treated the colonies like Lincoln treated the south, wed all be British today.
By that do you mean that in 1776 the Colonists fell strongly enough about their cause to win their rebellion and in 1861 the Southerners didn't feel strongly enough about their cause to do the same?
“So you admit that the Southern actions were a rebellion?”
The declaration permits the dissolution of common authority to preserve individual liberty in the face of tyranny.
You can argue that the South was misguided, but you cannot argue they did not have the authority, as free men and free people, to do what they did attempt.