Texas is very proud of the fact that it was one of 10 states that was a sovereign nation before joining the United States in the year 1846. It was independent from Mexico for ten years before being granted statehood (the third longest; the other two being the Republic of Vermont which lasted 14 years and the Kingdom/Republic of Hawaii which lasted 103). The state pledge of allegiance is a cultural holdover from that period.

The state culture in general (outside of the metropolitan zones) is very independence-minded and there's a general disdain present for the Federal government. Especially lately with how they've decided to handle the border. The State government recently even passed a law forbidding local law enforcement agencies from rendering aid to the ATF in regards to federal silencer laws, and our electrical grid is separate from the Federal grid for better or worse.

But yeah we don't like the Federal government.