The languages of Mesoamerica were also among the first to evolve independent traditions of writing. The oldest texts date to approximately 1000 BCE while most texts in the indigenous scripts (such as Maya) date to ca. 600 - 900 CE. Following the arrival of the Spanish in the 16th century, and continuing up until the 19th century, most Mesoamerican languages were written in Latin script. Many Mesoamerican languages today are either endangered or already extinct, but others, including the Mayan languages, Nahuatl, Mixtec and Zapotec, have several hundred thousand speakers and remain viable.
All of these factors together have made it exceedingly difficult to distinguish between what constitutes a language or a dialect in Mesoamerica. Linguistic isoglosses do not coincide often or strongly enough to prove very useful when trying to decide, and sociological factors often further cloud the picture. The significance of measurements of intelligibility (which is itself difficult to measure) depends very much on analysts' purposes and theoretical commitments. In Spanish the word “dialecto” has often been used generically about indigenous languages in order to describe them as inherently inferior to the European languages. In recent years this has caused an aversion to the term “dialect” among Spanish-speaking linguists and others, and the term “variante” has often been applied instead.
Many Mesoamerican linguistic groupings have not had different names in common usage for their different languages and some linguistic groups known by a single name show a sufficiently significant variation to warrant division into a number of languages which are quite low in mutual intelligibility. This is the case for example for the Mixtecan, Zapotecan and Nahuan linguistic groups, which all contain distinct languages that are nonetheless referred to by a single name. Sometimes a single name has even been used to describe completely unrelated linguistic groups, as is the case with the terms "Popoluca" or "Chichimeca". This shortage of language names has meant that the convention within Mesoamerican linguistics when writing about a specific linguistic variety is to always mention the name of the broad linguistic group as well as the name of the community, or geographic location in which it is spoken, for example Isthmus-Mecayapan Nahuatl, Zoogocho Zapotec or Usila Chinantec. Some language groups however have been more adequately named. This is the case of the Mayan languages, with an internal diversity that is arguably comparable to that found between the Nahuatl dialects, but many of whose linguistic varieties have separate names, such as K'iche', Tzotzil or Huastec.
Mesoamerica can be divided into smaller linguistic subareas wherein linguistic diffusion has been especially intense, or where certain families have extended to become predominant. One such subarea would be the Maya area covering the Yucatán Peninsula, all of Guatemala and Belize and parts the states of Chiapas and Tabasco, where Mayan languages have been highly predominant. In Chiapas and on the Guatemalan Pacific coast speakers of Mixe-Zoquean languages were initially dominant but with the spread of Mayan languages they were pushed out on the fringes of the areas or into isolated pockets, and the same was the case for speakers of Xinca and Lenca which were probably also spoken in the area in the preclassic period. Another linguistic area is Oaxaca which is dominated by speakers of Oto-Manguean languages, here Mixe-Zoque speakers were also gradually displaced by speakers of Zapotecan languages, as well as speakers of Huave and Tequistlatecan languages. Oaxaca is the most linguistically diverse area of Mesoamerica and its 36,820 sq. miles contain at least 100 mutually unintelligible linguistic variants. The subarea commonly called Central Mexico covering valleys and mountainous areas surrounding the Valley of Mexico originally contained mostly northern Oto-Manguean (Oto-Pamean) languages but beginning in the late classic they were gradually displaced by Nahuatl which is now the predominant indigenous language of the area. The Western area was inhabited mostly by speakers of P'urhépecha and some Uto-Aztecan languages such as Huichol and Nahuatl. The Northern Rim area has been inhabited by semi-nomadic speakers of Uto-Aztecan languages (the Tepiman and Cora-Huichol groups) as well as Pamean (Oto-Mangue), and other languages that are now extinct. The Gulf area is traditionally the home of speakers of Totonacan languages in the northern and central area and Mixe-Zoque in the southern area. However the northern gulf area became home to the speakers of Huastec in the preclassic period and the southern area fell under Nahuan dominance in the post-classic period. The Central American area was originally inhabited by speakers of Misumalpan, Jicaquean and Chibchan languages and these became subject to dominance and linguistic influence by Maya speaking groups in the classic period. Guerrero does not really constitute its own linguistic area and has been under influence from the Oaxacan, Western or central Mexican area at different times of its history.
The first human presence in Mesoamerica is documented around 8000 BCE, during a period referred to as the Paleo-Indian. Linguistic data, however, including language reconstruction derived from the comparative method, do not reach further back than approximately 5000 years (towards the end of the Archaic period). Throughout the history of Mesoamerica an unknown number of languages and language families became extinct and left behind no evidence of their existence. What is known about the pre-Columbian history of the Mesoamerican languages is what can be surmised from linguistic, archeological and ethnohistorical evidence. Often, hypotheses concerning the linguistic prehistory of Mesoamerica rely on very little evidence.
An important question that remains to be answered is what language or languages were spoken by the people and rulers of the empire of Teotihuacan. During the first part of the Classic period Teotihuacan achieved dominance over central Mexico and far into the Maya area. Possible candidates for the language of Teotihuacan have been Nahuatl, Totonac or Mixe-Zoque. Terrence Kaufman has argued that Nahuatl is an unlikely candidate because Proto-Nahuan did not enter Mesoamerica until around the time of the fall of Teotihuacan (ca. 600 AD), and that Totonac or Mixe-Zoque are likely candidates because many Mesoamerican languages have borrowed from these two languages during the Classic period. Others find Mixe-Zoque an unlikely candidate because no current Mixe-Zoque settlements are found in central Mexico. Around 500 - 600 CE a new language family entered Mesoamerica when speakers of Proto-Nahuan, a southern Uto-Aztecan language, moved south into central Mexico. Their arrival, which coincides with the decline of Teotihuacan and a period of general turmoil and mass migration in Mesoamerica, has led scientists to speculate that they might have been involved somehow in the fall of the Teotihuacan empire.
What is known is that in the years following Teotihuacan’s fall Nahuan speakers quickly rose to power in central Mexico and expanded into areas earlier occupied by speakers of Oto-Manguean, Totonacan and Huastec. During this time Oto-Manguean groups of central Mexico such as the Chiapanec, Chorotega and Subtiaba migrated south some of them reaching the southern limits of Mesoamerica in El Salvador and Nicaragua. Also some speakers of Nahuan moved south, some settling on the coast of Oaxaca where their speech became the language Pochutec, and others moving all the way to El Salvador, becoming the ancestors of the speakers of modern Pipil.
As Nahuatl, carried by the Toltec and later the Aztec culture, became a lingua franca throughout Mesoamerica even some Mayan states such as the K'iche' Maya state of K'umarkaj adopted Nahuatl as a prestige language. In Oaxaca Zapotec and Mixtec peoples expanded their territories displacing speakers of the Tequistlatecan languages slightly. During this time the P'urhépecha (Tarascans) consolidated their empire based at Tzintzuntzan. They were resistant to other states of Mesoamerica and had little contact with the rest of Mesoamerica. Probably as a result of their isolationist policy the P'urhépecha language is the only language of Mesoamerica to not show any of the traits associated with the Mesoamerican Linguistic Area. In Guerrero the Tlapanecs of Yopitzinco speaking the Oto-Manguean Tlapanec language remained independent of the Aztec empire as did some of the Oaxacan cultures such as the Mixtecs of Tututepec and the Zapotec of Zaachila. In the late postclassic around 1400 CE Zapotecs of Zaachila moved into the Isthmus of Tehuantepec creating a wedge of Zapotec speaking settlements between the former neighbors the Mixe and the Huave who were pushed into their current territories on the edges of the Isthmus..
The Spanish arrival in the new world turned the linguistic situation of Mesoamerica upside down. And from then on the indigenous languages have been subject to varying policies imposed on them by the colonial rule. The first impact came from the decimation of the indigenous population by diseases brought by the Europeans. Within the first two centuries of Spanish rule Mesoamerica experienced a dramatic population decline and it is well documented that at several small linguistic groups became completely extinct already during the 16th century. The policies that contributed most to a change in the linguistic situation of Mesoamerica were the policies used for conversion of Indians to Christianity. The first victim of this process was the native writing systems which were banned and prohibited and the existing texts destroyed - the pictorial scripts were see as an idolatry by the catholic church. At first missionaries favoured the teaching of Spanish to their prospect converts but from 1555 the first Mexican Council established the policy that the Indians should be converted in their own languages and that parish priests should know the indigenous language of their parishioners. This called for a massive education of clergymen in native languages and the church undertook this task with great zeal. Institutions of learning such as the Colegio de Santa Cruz de Tlatelolco which was inaugurated in 1536 and which taught both indigenous and classical European languages to both Indians and priests were opened. And missionary grammarians undertook the job of writing grammars for the indigenous languages in order to teach priests. For example the first grammar of Nahuatl, written by Andrés de Olmos, was published in 1547 - three years before the first grammar of French. During this time some literacy in indigenous languages written in the Latin script began to appear. In 1570 Philip II of Spain decreed that Nahuatl should become the official language of the colonies of New Spain in order to facilitate communication between the Spanish and natives of the colonies. Throughout the colonial period grammars of indigenous languages were composed, but strangely the quality of these were highest in the initial period and declined towards the ends of the 18th century. In practice the friars found that learning all the indigenous languages was impossible and they began to focus on Nahuatl. During this period the linguistic situation of Mesoamerica was relatively stable. However, in 1696 Charles II made a counter decree banning the use of any languages other than Spanish throughout the Spanish Empire. And in 1770 a decree with the avowed purpose of eliminating the indigenous languages was put forth by the Royal Cedula. This put an end to the teaching of and writing in indigenous languages and began a strict policy of hispanization of the Indians. However the fact that today around five million people in Mesoamerica still speak indigenous languages suggest that this policy wasn't as effective after all. The most important factor towards the decline of indigenous languages in this period has probably been the social marginalization of the native populations and their languages - and this process has been particularly effective during modern times.
Within the last 20 years there has been an overt change in the policies of governments of Mesoamerican countries towards the indigenous languages. There has been official recognition of their right to existence and some kind of governmental support, to the point of recognizing them as national languages. Bilingual (rather than monolingual Spanish) education has been recognized as desirable even if not always actually achieved in practice. In Guatemala the recognition of the indigenous languages as official languages and a valuable part of the country’s identity came after the Civil War which ended in 1996. In Mexico shifting governments had talked about the value of the country’s indigenous heritage but it was not until 2002 that the "Ley General de Derechos Lingüísticos de los Pueblos Indígenas" established a framework for the conservation, nurturing and development of indigenous languages.
Despite these official changes, old attitudes persist in many spheres, and indigenous languages are not in any practical sense on a par with Spanish. At present the linguistic situation of Mesoamerican languages is most difficult in the Central American countries like Honduras, El Salvador and Nicaragua where indigenous languages still do not enjoy the rights or privileges now granted them elsewhere, and are still subject to social stigmatization.
Mesoamerica is one of the relatively few places in the world where writing has developed independently throughout history. The Mesoamerican scripts deciphered to date are logosyllabic combining the use of logograms with a syllabary, and they are often called hieroglyphic scripts. Five or six different scripts have been documented in Mesoamerica but archaeological dating methods make it difficult to establish which was earliest and hence the forebear from which the others developed. Candidates for being the first writing system of the Americas are Zapotec writing, the Isthmian or Epi-Olmec script or the scripts of the Izapan culture. The best documented and deciphered Mesoamerican writing system, and hence the most widely known, is the classic Maya script. Post-Classic cultures such as the Aztec and Mixtec cultures did not develop true writing systems at all, but instead used semasiographic writing although they did use phonetic principles in their writing by the use of the rebus principle. Aztec name glyphs for example do combine logographic elements with phonetic readings. From the colonial period on there exists an extensive Mesoamerican literature written in the Latin script.
The literature and texts created by indigenous Mesoamericans are the earliest and well-known from the Americas for two primary reasons. First, the fact that native populations in Mesoamerica were the first to interact with Europeans assured the documentation and survival of literature samples in intelligible forms. Second, the long tradition of Mesoamerican writing contributed to them readily embracing the Latin alphabet used by the Spanish and resulted in many literary works written in it during the first centuries after the Spanish conquest of Mexico. Some important literary works in Mesoamerican languages are: The mythological narrative of the Popol Vuh and the theatrical dance-drama the Rabinal Achí both written in K'iche' Maya. The ethnographical mammoth work in the Florentine Codex and the beautiful songs of the Cantares Mexicanos both written in Classical Nahuatl. The prophetical and historical accounts of the books of Chilam Balam written in the Yucatec Maya language. As well as numerous smaller documents written in other indigenous languages throughout the colonial period. No true literary tradition for Mesoamerican languages of the modern period has yet emerged.