Like many Tejanos, in spite Santa Ana's oppressive rule over Texas, de la Garza believed Texas should remain part of Mexico. However after the Texas Revolution, Garza joined the populist call for the U.S Annexation of Texas in 1845. He realized this would be a help in the rule of law and would give Mexican Tejanos many rights which were being suppressed by the Anglo rule in the Republic of Texas. Carlos Rancho survived an 1845 legal attempt by Louisiana resident Thomas Taylor Williamson to seize the land from Garza.