Huasteca Nahuatl is a Nahuan language spoken by over a million people in the region of La Huasteca in Mexico, centered in the states of Hidalgo (Eastern) and San Luis Potosí (Western).
Ethnologue divides Huasteca Nahuatl into three languages: Eastern, Central, and Western, as they judge that separate literature is required, but notes that there is 85% mutual intelligibility between Eastern and Western.
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The Nahuan or Aztecan languages are those languages of the Uto-Aztecan language family that have undergone a sound change, known as Whorf's law, that changed an original *t to /tɬ/ before *a. Subsequently, some Nahuan languages have changed this /tɬ/ to /l/ or back to /t/, but it can still be seen that the language went through a /tɬ/ stage. The most spoken Nahuatl variant is Huasteca Nahuatl. As a whole, Nahuatl is spoken by about 1.7 million Nahua peoples.
Some authorities, such as the Mexican government, Ethnologue, and Glottolog, consider the varieties of modern Nahuatl to be distinct languages, because they are often mutually unintelligible, their grammars differ and their speakers have distinct ethnic identities. As of 2008, the Mexican government recognizes thirty varieties that are spoken in Mexico as languages (see the list below).