Or rather, was found to have never had the right to secede in the first place. Any vote to leave is less a declaration of secession and more a declaration of a war of independence against the United States.
Presumably somewhere in Texas, this time they'll have nukes. They shouldn't 🤞 have a way to use them, but it's curious what would happen with them if a vote to secede was successful.
Why would that be the case? Nuclear missile silos are concentrated in the north central United States specifically to give them more time to fire before detection and landfall of incoming ICBMs.
The vulnerability of Texas to a submarine launch is too great to consider it a base for launch in a mutually-assured destruction scenario. It also doesn't have any reactors capable of producing isotopes needed for nuclear weapons.
I won't claim to know about ability to produce the components of a weapon or ability to actually use one, but it appears that the only facility in the US that has the capacity to assemble or disassemble nuclear weapons is in Texas.
If they seceded I'm sure the federal government would make the argument that they are on federal land, even if it's within the Texas borders. Since it wasn't state land, their secession wouldn't apply so it would remain the USA. If Texas wanted to refuse the US Federal government access to them, they'd learn a swift lesson. Texas has a lot of guns, but the army has more.