None
...why are they not now independent nations of the world?
Because.
Insolently(sic) the exact same method by which the 11 southern States in 1860-1861 left the union.
I would agree that they left in an insolent manner, but not in a legal one.
“I would agree that they left in an insolent manner, but not in a legal one.”
Then how does one leave in a “legal” manner if it is not by the same method they entered?
Also where was this method of exit ceded in the Federal Constitution?