Texas would be less prosperous and would have less number of cities being more rural.
Step-by-step explanation:
The founding of the oil industry in Texas changed the state completely.
It had previously been one of the most stubbornly farming areas of the country where the whole population had been generational peasants and they were not looking to change that for long either.
This was until the oil was found and many manumitting and mining towns were set up which offered better jobs to many and took over the farms.
This would all not happen and the state would not be rich from the oil money instead being an agrarian economy with many Spanish speakers and in general not as much in bigger towns,