Roger Taney was Chief Justice of the United States for 28 years. His word has some authority.
I also gave you a Supreme Court case, Texas v. White, which came to the conclusion that the Texas ordinance of secession was absolutely null.
And, I pointed out the deaths of a million men who debated his viewpoint. Was he Casear? No he wasn’t. He prevailed because his side won, not because he was right. The US Constitution does not prohibit secession....if you can find where it does, I’m all ears.