Monclova has from 1833 been the capital…
1835 CE
Monclova has from 1833 been the capital of Coahuila y Tejas ("Coahuila and Texas"), one of the constituent states of the newly independent United Mexican States under its 1824 Constitution.
It had originally included Texas, Coahuila, and Nuevo Leon, but Nuevo Leon had been detached later in the same year.
Texas has remained a part of the state but in 1835 it secedes to form the Republic of Texas.