No. The states in the south did succeed from the union.
The US Constitution had no provision for that, therefore it was left to the states to do just that if they wished.
There is no insurrection of a government you do not belong to.
The “War of Northern Aggression” is the applicable term.
“Once in, always in”, an early and American version of the Brezhnev Doctrine.
In both cases if you objected, the powerful central government was eager and willing to slaughter you to correct your misperception.
Probably not a coincidence that OG commie Karl Marx was an ardent supporter of the 1860 episode.
The US Constitution had no provision for that, therefore it was left to the states to do just that if they wished.
So you're saying that the Constitution allows a state or states to use it to punish or harm the interests of the other states? I'd love to see you quote where.
The “War of Northern Aggression” is the applicable term.
LOL! I'll bet you call World War II the 'War of Polish Aggression' too.
Except when, having declared your secession, you then start (April 12) and formally declare (May 6) war against the United States.
The Confederacy declared war on May 6, 1861.
Lincoln declared Confederates in insurrection on April 19 and Congress agreed with Lincoln's naming it a rebellion on July 4, 1861.
SCOTUS's supremely Crazy Roger Taney had a lot of problems with Lincoln, but after the war in Texas v. White agreed the war was rebellion and secession did not stand.