[BroJoeK]

DiogenesLamp: "Yes, British Law didn’t allow people to give up their allegiance. Our Declaration of Independence made it a fundamental right to do so."

But not "at pleasure", only from necessity and destructive conditions as itemized in the Declaration of Independence.

No such conditions or necessity remotely existed in 1860 when Fire Eaters began declaring secession at pleasure.
Further, when unilaterally declared secession leads to rebellion, insurrection, domestic violence, invasion, declared war and treason against the United States, all possible constitutional protections for it are withdrawn.

All of which you know, but refuse to acknowledge, preferring instead your own historical fantasies.

[DiogenesLamp]

Not going to grant your “at pleasure” prohibition any consideration. The difference between “at pleasure” and “necessity” is completely in the eye of the beholder.