>>Prior to becoming a state Texas was an independent nation. An agreement between two or more independent nations is a treaty. Under international law any party to a treaty can nullify/withdraw from that treaty. So yes Texas, under international law recognized by the USA, can secede.
and no Texas did not give up for all eternity it’s right to be an independent republic should the people of Texas decide to once again be an independent republic.<<
One more time — you are wrong. When a State becomes a State it is that forever. Texas has no special status as a State and its secession would be the same as any other.
See my other comments upthread on some possible scenarios.
Legally, Texas may NOT secede.
Hitler has spoken....