Answer
"The Comanche and Kiowa controlled western Texas" is probably the answer you are searching for
Explanation
Because of the Comanche and Kiowa conquests in western Texas, Sam Houston's first term as president was fraught with difficulty.
Upon taking office, he was met with a few challenges. One was from the Comanche and Kiowa tribes, one of Texas' major tribes, who controlled western Texas and had an effect on Houston's rule. In addition to being a distinguished American general and statesman, Samuel Houston played a key role in bringing about the Texas Revolution in earnest.