As I've said now several times: our Founders fully acknowledged a "right to secede" with mutual consent, or as a result of "oppression" or "injury", etc.
What no Founder -- zero, zip, nada -- acknowledged was a "right to secede" "at pleasure".
And yet, when the Deep South began to declare secession after the November 1860 election it was clearly understood by all, at the time, to be secession "at pleasure".
FRiend, it takes a determined effort to ignore these basic facts, and it is that effort itself which is the heart and soul of being "pro-Confederate".
What would the Southern states had to do to secede with mutual consent?
It seems to me that this would require begging release from a tyrant.
You evidently haven’t read the Bill of Rights.