A trial was held on the legality of the pretended secession. Texas v. White. The rebels lost that too.
Sigh.... once again, there were no rebels by that time and the bogus SCOTUS of the day was completely filled with Lincoln appointees and a couple of Confederate haters. Or are you one of those liberals who believe SCOTUS is always right no matter what...like on abortion and eminent domain?
NO ONE associated with the Confederate States or representing the Founding Fathers beliefs sat on the court. It was a Kangaroo SCOTUS.