There is a federal statute in Title 18 of the U.S. Code that outlaws attempts to do that very thing. In its entirety, it reads:
“Whoever knowingly or willfully advocates, abets, advises, or teaches the duty, necessity, desirability, or propriety of overthrowing or destroying the government of the United States or the government of any State, Territory, District or Possession thereof, or the government of any political subdivision therein, by force or violence, or by the assassination of any officer of any such government; or
Whoever, with intent to cause the overthrow or destruction of any such government, prints, publishes, edits, issues, circulates, sells, distributes, or publicly displays any written or printed matter advocating, advising, or teaching the duty, necessity, desirability, or propriety of overthrowing or destroying any government in the United States by force or violence, or attempts to do so; or
Whoever organizes or helps or attempts to organize any society, group, or assembly of persons who teach, advocate, or encourage the overthrow or destruction of any such government by force or violence; or becomes or is a member of, or affiliates with, any such society, group, or assembly of persons, knowing the purposes thereof
Shall be fined under this title or imprisoned not more than twenty years, or both, and shall be ineligible for employment by the United States or any department or agency thereof, for the five years next following his conviction.”
The operative words in the statute are “force or violence” and, given that a Texit, initiated by a legal process, ratified by a vote of the people of Texas, and secured by a declaration of the reclamation of the right of self-determination, is neither force nor violence, Texit is not the same as overthrowing the government.
It is this reason that TEXIT must follow a legal, peaceful, political process.