What if the mexican army had been able to defeat the Texan rebels, Not so far fetched since the texans were outnumbered hopelessly
You might see Mexico adopt the colonial Spanish practice, colonize the area with tribes loyal to the state.
the stated goals for Mexico were pretty clear. American immigration would be stopped, taxes and customs would be properly collected... basically, Texas would be put under control of the Mexican government. I always thought that the Texas revolution was an odd parallel of the American Revolution; both were areas that had been neglected by the mother country, both had preferential tax and customs rules, both rebelled when the mother country sought to establish real control over them, and both succeeded against long odds.
If Mexico was smart, they'd grant Texan independence under the circumstance that the border is the Rio Grande(no westward expanasion), and it's prohibited from joining the United States.
This would ensure Mexico a buffer state so to say, and likely allow them to retain California and New Mexico.
My undertanding is he also wanted to kick out the Americans already there. Or is that wrong?