The were a group of individuals that were given second-class citizenship.
a. peninsulares
c. mulattoes
b. creoles
d. mestizos

one of the main reasons was definitely slavery. back in 1861, republican abraham lincoln was elected and ended up being a major influence in the slavery business. slavery greatly affected the texas economy because back in 1845 during the annexation of texas, slaves became a big part of the texas population. many texans that were in favor of the secession influenced groups through party ties.

use wikipedia, i think they have this.