There is federal property involved with a secession of a state, property paid for by all the states. Therefore a state must allow the Congress to prescribe the manner in which a state proves its act of secession.
“There is federal property involved with a secession of a state, property paid for by all the states. Therefore a state must allow the Congress to prescribe the manner in which a state proves its act of secession.”
That’s just speculation on your part, the Constitution says no such thing. As I said, Congress already prescribed the manner in which acts of state are proved, and it can only prescibe that in general laws, according to the Constitution. It cannot make a new, specific law governing secessions separate from the rest of the acts to be proved. If the Acts of Secession were passed lawfully, and published to the rest of the States and the Federal Government by the same process as any other law, then they fully satisfied this condition.
That’s probably nobody ever cites this as some kind of barrier to secession, because it just isn’t.