Why did Texas go to war with Mexico

Slavery was against Mexican law, but Americans brought slaves to Texas. Many American settlers and Tejanos , or Mexicans who lived in Texas, wanted to break away from Mexico. They did not like laws made by Santa Anna , Mexico’s president. The Tejanos and Texans decided to fight for independence.

i belive it is answer  A.

Explanation:

the americans were upset, and demanded that the united states enter the war.