Yeah, the states rights to own slaves.
If I could save the Union without freeing any slave I would do it, and if I could save it by freeing all the slaves I would do it; and if I could save it by freeing some and leaving others alone I would also do that.
Just goes to show that the sticking point wasn't slavery, it was Independence. Lincoln was willing to tolerate slavery, but he wasn't willing to tolerate Independence for the Southern States.
“Yeah, the states rights to own slaves.”
Like George Washington and Thomas Jefferson did?