Well Texas was its own country for a few years. We fought for independence from another country and the United States at the time didn't help to much. Heck we even had our own White House. Also according to the law we still have the right to susceed from the union. I suppose long time Texans just have not gotten over it all yet.
BTW I am a Texan that has seen the world and I do know there are other places than here. It is just here is home.