Final answer:
Texans viewed Tejanos as dishonest, ignorant, and backward due to cultural and racial differences, as well as conflicts over slavery.
Step-by-step explanation:
During the Mexican War, many Texans viewed Tejanos as dishonest, ignorant, and backward due to a combination of factors, including their dislike of Roman Catholicism, a belief in American racial superiority, and the Mexican government's attempts to assimilate American settlers into Mexican society. Texan settlers were predominantly from southern states and brought enslaved people with them, which created further tension with the Mexican government's abolition of slavery in 1829.