Proper noun
Coahuila y Tejas
(historical) A former constituent state of the United Mexican States, part of which revolted and became the Republic of Texas, the rest stayed and remained as Coahuila. Official name: Estado Libre y Soberano de Coahuila y Tejas.
By 1834, an estimated 30,000 Anglos lived in Coahuila y Tejas, Manchaca (2001), p. 201. compared to only 7,800 Mexican-born residents. Source: Internet
Anti-slavery Whigs considered Texas annexation particularly egregious, since Mexico had outlawed slavery in Coahuila y Tejas in 1829, before Texas independence had been declared. Source: Internet