With no welfare payments to parasitical urban areas, vast cheap energy resources of shale oil, coal and natural gas, the new country is an energy colossus. Cheap energy and unhindered non union labor translates to prosperity and wealth.
What would the energy poor states of the midwest, the west and the east do?
Buy the energy, of course. What do you think they do now?
Best not to count on that oil lasting forever.
And Texas has had a very volatile economy tied to the price of oil and things like Enron.
For that matter, you might not want to count on that non-union thing, either. Texas is Republican because it's a way of voting against the Northeast and the West Coast liberals. With them out of the picture, you might find pro-union Texas liberals a lot stronger.