Texas tried waging war on other states before, and they were stopped by the Federal government wielding superior force.

You know that guy on five dollar bills? He was involved.

There is enough stuff (goods) in both Texas and Oklahoma where going to war would make people there worse off.

If I can go to war with Oklahoma and get a 2nd/3rd car, when I already own a car, why would I risk losing my life? I can't drive 2 cars at once.

Because Okies would sweep them:

https://en.wikipedia.org/wiki/Red_River_Bridge_War

You do realize US territories have fought each other before, right?

https://en.m.wikipedia.org/wiki/Honey_War