Language families.

The progress of linguistics, archaeology and genetics, makes it possible to provide a plausible explanation for the existence of such a huge number of different languages. Their systematic study and comparison in terms of type and structure, have brought linguists to discover so many similarities among some of the languages, as to assume their possible descent from common ancestral languages. This kind of relationship has been given the name of language family. Languages evolve and spread based on processes which are almost clear, although some respects of this evolution are controversial. Genetic research conducted on several populations worldwide has recently brought scientists to draw a human family tree based on genetic characters, which can be largely superimposed on a similar tree drawn on linguistic data alone. Paleoanthropological research relating to the origin of the species Homo sapiens, and archaeological research relating to cultural changes and migrations, supported by increasingly reliable dating techniques, have provided important confirmation elements of language spread assumptions.
The early migration Genetic, paleoanthropological, and archaeological data let us believe that modern humans (H. sapiens) have emerged in Africa between 200 000 and 100 000 years ago, have started a slow migration from Africa to other continents, and have relegated to increasingly narrow and remote regions other existing human species (H. neanderthalensis present in Europe as late as 30 000 years ago), till their extinction. This early migration, that has extended over 80 000 years, has brought the modern humans to all continents, with a northern latitude limit (approximately 54 degrees northern latitude) due to ice ages taking place. Evidence of the migration survives in certain language isolates and language families whose spreading territories feature high linguistic diversity (a patchwork of languages in a certain region), this circumstance proving in general long permanence of a language in a territory without being replaced by external languages (language differentiation due to divergence by separation between the languages):
	*Khoisan* (the languages spoken by San and Khoikhoin peoples) in Namibia and South Africa
	Nilo-Saharan in Central and Eastern Africa
	Basque in the region between Spain and France
	Caucasian in the region between the Caspian Sea and the Black Sea
	Daic in Viet Nam, Thailand, Laos, Cambodia
	Andamanese in the Andaman Islands
	Australian (non-Pama-Nyungan languages spoken in North Western Australia and the Northern Territory)
	Amerindian (patchwork of languages spoken in the American Continent)
*The spreading of agriculture* The development of agriculture on the part of nuclear communities of food gatherers, followed by increasing availability of food, increase of birth rate and decrease of premature death risk, has brought the increase of local population, hence the necessity of enlarging the cultivable and the grazing land, and the need for farming families to move on the land. Therefore, the languages spoken by the original communities have spread and evolved, following the spreading of agriculture, as a slow demic diffusion process, which in the course of thousands of years has brought some language families to extend over extremely vast regions:
	*Indo-European*, a language family linked to the domestication of wheat, extending from Anatolia to the Balkans, to European Russia, to all the European continent with the already mentioned northern latitude limit, except the Basque region
	Dravidian, extending from the Zagros region to the Indian peninsula
	Afro-Asiatic, in Middle East and North Africa
	Niger-Kordofanian, a language family originating in Subsaharan Africa and extending in the Niger, Congo and Zambezi basins
	Sino-Tibetan, a language family linked to the domestication of millet and rice in China
	Austronesian, a language family originating from the cultivation of taro and rice in South Western Asia and spread in the course of 10 000 years from Madagascar to Easter Island
The diffusion of languages connected to recent climate changes A new opportunity for human diffusion opened when the most recent ice age ended (about 10 000 years ago) in widespread heating of dry lands: the belt of lands located over the 54 degrees latitude limit was gradually populated by groups speaking languages whose evolution brought the language families:
	*Uralic* in northern regions of Europe
	Chukotko-Kamchatkan in the farthest Asian Russia
	Na-Dene in Canada
	Eskimo-Aleut on the shorelines of Arctic and Subarctic regions of the American Continent and the farthest strip of North Eastern Siberia
*The substitution of languages by dominant languages* In the course of late prehistory and historic ages, certain cultures succeeded in establishing their domination over other territories using their organisation capabilities, or the authority resulting from technological know-how, or the use of their military force, thus widening the diffusion of the languages they spoke. That was the case for the spreading of the Indo-European family toward Iran, Pakistan and Northern India in the second millennium BC, and the spreading of the Altaic family in Central Asia, based on the force of horse riding warriors. That was also the case for the spreading of Common Greek (Koiné) in Mediterranean basin countries, which was based on the authority of the Greek culture, and the spreading of Latin in European countries, which was based first on the army and the law of Rome and then on the authority of the Christian Church.
Language families, groups and subgroups of languages
To learn more
	Linguist List This site of the Eastern Michigan University / Waine State University is dedicated to providing information on language and language analysis, and to providing the discipline of linguistics with the infrastructure necessary to function in the digital world.
	Ethnologue A catalogue of more than 6800 languages spoken in more than 220 countries, published by Summer Institute of Linguistics, an organisation conducting research in linguistics, whose aim it is to promote communication among cultures and to develop documentation useful for linguists, translators, anthropologists, missionaries, language teachers, public officers and administrators, and everybody interested.
	The Rosetta Project A global collaboration of language specialists and native speakers working to build a publicly accessible online archive of all documented human languages, to create the most broad and complete reference work on the languages of the world to date.
	The language families of the world A collection of maps showing the geographical distribution of the major language families, by dr. C. George Boeree, based on the work of the great linguist Joseph Greenberg.