“Stop trying to deny what’s true, DM.”
You make a reference to a geographic adjective, and not a cause.
You should read with a little less bias.
Ah, yes.... as if there were any "property" other than slaves in play.
The Declarations of Secession were very clear that this was what they were talking about.
The gentlemen of Mississippi declared, "Our position is thoroughly identified with the institution of slavery - the greatest material interest of the world."
They stated that hostility to slavery "has grown until it denies the right of property in slaves...."
And they went on to say, "We must either submit to degradation, and to the loss of property worth four billions of money, or we must secede from the Union framed by our fathers..."
You should read with a little less bias.
You should stop lying to yourself. The Southerners themselves wrote down for you exactly why they were leaving. You just choose not to admit the truth of what they, themselves, said.