Mexico was mentioned a while ago in this discussion.

The native people of Mexico have been abused by each other, by tribes that now are within the US, by the Spanish Conquistadors, and now by the corrupt Mexican government. Many speak no Spanish, just their native languages.

Here is a list (note: some tribes are found on both sides of the US/Mexico border):

Amuzgo
Aztecs (Mexicas)
Chatino
Chichi-Pooloca
Chichimeco Jonaz
Chinanteco
Chol
Chontal (de Tabasco)
Chuj
Cochimi
Cora
Cucapa
Cuicateca
Guarijio
Huasteco
Huave
Huichol
Ixcateco
Jacalteco
Kikapu (Mexican Kickapoo of northern Coahuila state)
Kiliwa
Kumiai
Lacandon
Lipan Apache (north of Chihuahua)
Mame
Matlatzinca
Mayans
Mayo
Mazahua
Mixe
Mixteca
Motozintleco
Nahua
Olmec
Opata (Northwestern Sonora)
Otomi
Paipai (akwa'ala)
Pame
Papago
Pima (Alto/Bajo)
Popoloca
Popoluca
Purepecha (Tarasco)
Seri
Tarahumara
Tepehua
Tepehuano
Tequistlateco (Chontal de Oaxaca)
Tlapaneco
Tojolabal
Tolteca
Totonaco
Trique
Tzeltal
Tzotzil
Yaqui
Zapoteco
Zoque