I'm disappointed that you keep posting this stuff after it has been confuted.
It wasn't a "rebellion": it is ontologically impossible to "rebel" against something of which one is no longer a member.
Southerners always had the right, as did every State in the Union, to withdraw from the Union either singly or en bloc. If Alaska were tomorrow designated the National Trash Dump and Parking Lot, I'd expect them to withdraw from the Union, too, and for good cause.
Southern States exercised their rights as sovereign (we've established that), free Peoples to dissolve the ties between themselves and the Union, just as our ancestors dissolved their tie to the British Crown.
The level on which the Southern States acted was as Peoples, as Sovereigns.......please get it through your held, N-S, that as among sovereigns, there is no Law!
Among sovereigns, the only law is treaty law, and treaties are only as good as agreement among the principals makes them. Capiche?