Indigenous languages of the Americas are spoken by indigenous peoples from Alaska and Greenland to the southern tip of South America, encompassing the land masses which constitute the Americas. These indigenous languages consist of dozens of distinct language families as well as many language isolates and unclassified languages. Many proposals to group these into higher-level families have been made, such as in three macrofamilies of Eskimo–Aleut, Na-Dene, and Amerind, though this scheme is rejected by nearly all specialists. According to UNESCO, most of the indigenous American languages in North America are critically endangered, and many of them are already extinct. The most widely spoken indigenous language is Southern Quechua, with about 6 to 7 million speakers. Wikipedia