You get Texas citizenship by living in Texas. You are always considered a citizen of the state in which you reside.
this territory is moderated
define "reside"
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Really, it depends on why you want "citizenship" of a particular state. What your purpose is.
If I am wronged within the Texas borders and I am suing someone for it, I could use the Texas Constitution as well as the US Constitution, even if I do not consider myself a "citizen" of Texas.
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Hmm... that sounds like a federal perspective, not a state perspective.
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