Not one nation but hundreds — the small, separately named hunting bands of the thorn-scrub country between the Sierra Madre Oriental and the Gulf, whose land Cabeza de Vaca crossed on foot in 1534.
Not an ending: the bands were absorbed into the mission, ranch and town populations of Coahuila, Nuevo León, Tamaulipas and south Texas, whose descendants carry the ancestry; as late as 1886 the ethnologist Albert Gatschet still found Comecrudo, Cotoname and Pakawá speakers near Reynosa.
The polity-specific study reconstructing the named Coahuiltecan bands of the lower Rio Grande from Spanish records.