Why did texas almost fail as a spanish colony

The Spanish failed to plan for the hostility of the Comanche and Apache Indians living in the area. Thus, the difficult geography, the weak missions, and hostile Indians were the main causes of the near failure of the Spanish colonies in Texas

a. because the u.s. was the leading with the most technology, economy, etc. also was teamed with other allies witch boosted the economy and materials to improve technology and use it.

d) a constitutional amendment