[x]

At least one of our worst presidents was a Texan, which leads me to think that maybe other states wouldn't be very happy in a new country organized around Texas. Maybe Texas wouldn't be altogether happy without some big project that people elsewhere wouldn't be too keen on.

But regardless of what Texas does or doesn't do, other states wouldn't want to be just an appendage of somebody else's new country, so unless Texas itself is split up into smaller states, I can't see Oklahoma or Kansas or Louisiana wanting to be the tail of a very large dog.

[Windflier]

...maybe other states wouldn't be very happy in a new country organized around Texas.

You appear to have a stuck consideration that Texas will try to become the de facto 'boss' of the secessionist states. I don't know where you're getting that, but nothing could be further from the truth.

If you're so worried about it, stay behind and tough it out in the old union, or become an expat in some other country. You don't have to be our countryman if you don't want to. You've got all kinds of choices.