Mexico gained independence from Spain and it included many parts such as Guatemala, Texas and parts of Colorado and Arizona. It invited american settlers to defend the Texas frontier from annexation by Spain.
Step-by-step explanation:
Due to the territorial expansion Mexico started to invite american settlers by relaxing the immigration policies and it asked america to populate the northern territories. Texas was sparsely populated at that time and Americans had the great talent to make it develop into a commercial hub. So mexico decided to offer major land grants to Americans and it wanted the Americans to be loyal to Mexico and convert to Catholicism.
Americans whop settled in Mexico had courage to fight the dictatorship of General Santa Anna but they were happy that they own a land. American settlers appreciated democracy which brought Texas revolution.