[NaturalScience]

“Would you please provide a link for that?"

It's in the Texas Constitution (both the original and the current).

Article 1, Section 2: "...The faith of the people of Texas stands pledged to the preservation of a republican form of government, and, subject to this limitation only, they have at all times the inalienable right to alter, reform or abolish their government in such manner as they may think expedient."

If that's not good enough, there's similar verbiage in the U.S. Declaration of Independence, minus the "inalienable right" part. The fact that the Texas Constitution refers to it as an "inalienable right", means NO ONE can take it away, not even the U.S. Government under the guise of "unconstitutionality."

Of course, none of that trumps the authority of an all-powerful "Federal" Judge. /s

[Mr. Lucky]

The claim was made that ...the very articles by which their legislature approved entering the union contained language reserving the right to leave the Union. Apparently, they didn't.

[Hulka]

Thank you for your kind reply.