You’re assuming a newly-seceded Texas would be welcoming immigrants.
I sure as Hell wouldn’t.
And I also wouldn’t give countenance to purported asylum seekers.
Nor would I permit anyone admitted to become a Citizen in anything less than 3 years; preferably 5.
Non-citizens would be proscribed from holding any government office as well as any office in any municipally-connected or para-government org; PTA, HOA, NextDoor Moderator — NONE of it.
The voting franchise would be reserved to Citizens ONLY and certified by presentation of valid ID.
I’m still mulling whether to further restrict voting to just actual owners of real property...
Well; we'll be seeing how an UNseceded Texas is going to handle the soon coming push to shove event at the border.