Read this AGAIN.....If you go back to the 1787-88 debates in the New York, Rhode Island, Virginia, and North Carolina legislatures, you will see many examples of secession discussions. There were several efforts to codify, modify, and place limits on states involved in seceding. State legislatures would not make secession illegal, and thus neither did the Constitution.
So that this is perfectly clear, ratifying state legislatures would not in any way limit secession.
And as I said also, given the opportunity to pass legislation limiting secession, neither would the US Congress.
Right - they talked about circumstances that would warrant such a drastic move and possible mechanisms to facilitate such an action but none of those talks bore fruit.
None of them accepted the notion of unilateral secession or dissolution “at pleasure”.