Hypothetical from a non American. Let's say Texas DOES secede. What happens to the citizenship of the Americans in Texas? Do they lose it? Do they have to leave Texas in X days to keep it? Can it even be revoked? Should it?
If they kept it, would they need to still declare their taxes, as US citizens must pay tax on international income?
They would become a territory, like Puerto Rico.
They would still have citizenship and the benefits of citizenship, such as they would still have taxes. But would not vote in presidential elections, and their representatives would get no vote.
You mean their politicians can just blame everything on the federal government and pretend they took their voting rights away? Sounds like a dream for them.
I'm not like a US civil war scholar or anything, but there's at least a glimmer of precedence to be found there with what happened to average folk living in the Confederate States when those states seceded. Babies born in the Confederacy were considered US citizens because the US (the Union) never recognized the Confederacy as independent and legally considered it US territory still. As for adults, it was similar... The US treated them as if they had never lost US citizenship and either punished or pardoned people for treason and war related crimes after the war. So I guess the answer would depend on whether Texas wins or loses the inevitable war that the US would fight to keep Texas from seceding/declaring independence in the first place.
To add to that- it’s nearly impossible to lose American citizenship against one’s will. If you were born a citizen or earned it later, you will likely remain a citizen until you die, unless you give it up.
The other replies to you are wrong. Texas can't secede. Unlike the EU, joining the United States is one-way. No matter what laws the Texas government passes, or claims to be true, from the perspective of the US gov't they cannot leave the union (or revoke US citizenship from their residents).
If you're looking for precedence, see the US civil war which settled the matter pretty decisively.