A. Texans opposed Mexico's tax increase and ban on immigration.
The main reason for the Texas Revolution of 1835-1836 was that Texan settlers, who were mostly from the United States, opposed Mexico's increasing interference in their affairs, including the imposition of tariffs and a ban on further immigration from the United States. This led to a series of clashes between Texan settlers and the Mexican military, ultimately resulting in the establishment of the Republic of Texas as an independent nation.