Wasn’t the problem with secession dealt with by Salmon P. Chase in a SCOTUS ruling about Texas back in 1869?
https://en.wikipedia.org/wiki/Texas_v._White
In accepting original jurisdiction, the court ruled that, legally speaking, Texas had remained a United States state ever since it first joined the Union, despite its joining the Confederate States of America and its being under military rule at the time of the decision in the case.
****In deciding the merits of the bond issue, the court further held that the Constitution did not permit states to unilaterally secede from the United States, and that the ordinances of secession, and all the acts of the legislatures within seceding states intended to give effect to such ordinances, were “absolutely null”.[2]****
There you go again, trying to apply logic to an illogical people. :-) The US Constitution means nothing to libturds.