For centuries, Spain had imposed essential slavery on the indigenous Indians of Mexico. This ended when Mexico became free of Spain. Slavery was abolished by the 1824 constitution of Mexico.
Oddly enough, the Texas Revolution started not over slavery but because Santa Anna had tossed out the 1824 constitution and become dictator. (Got to watch those rulers who tromp on constitutions.) The first flag of the Texans fighting Santa Anna in fact had the number 1824 emblazened on it. A number of Mexicans in Texas supported the fight with Santa Anna.
Who knows. The way things are going, Texas will eventually have an Hispanic governor as a result of the number of people crossing the border. Their time will come.
Jeez, do you actually believe this is the only way a hispanic can get elected governor in Texas? If a hispanic republican ran against a anglo democrat for governor, would you vote for the democrat?