According to the joint resolution for annexing Texas, Congress said Texas could break up into five states but all would have to be part of the U.S.
And another reason Texas cannot legally secede is because of the Supreme Court case Texas v. White. Even if the Texas legislature voted to secede, the action would be “absolutely null,” according to that Supreme Court case.
The U.S. Constitution also does not explicitly provide for the possibility of secession.
"The aspiration of the preamble is to create a more perfect union," added UT law professor Sanford Levinson. "Itself suggests that there can be no secession because, by definition, secession destroys the existing union rather than making it more perfect."
“The aspiration of the preamble is to create a more perfect union,” added UT law professor Sanford Levinson. “Itself suggests that there can be no secession because, by definition, secession destroys the existing union rather than making it more perfect.”
That makes no sense. Unless perfect means bigger, which it doesn’t.
The tenth amendment does not deny the right of secession to the states.