Proto-Indo-Iranians

The introduction of the Indo-Aryan languages in the Indian subcontinent was the result of a migration of Indo-Aryan people from Central Asia into the northern Indian subcontinent (modern-day Bangladesh, Bhutan, India, Nepal, Pakistan, and Sri Lanka). These migrations started approximately 1,800 BCE, after the invention of the war chariot, and also brought Indo-Aryan languages into the Levant and possibly Inner Asia.^{[citation needed]} Another group of Indo-Aryans migrated further westward and founded the Mitanni kingdom in northern Syria;^[11] (c. 1500–1300 BC) the other group was the Vedic people.^[12] Christopher I. Beckwith suggests that the Wusun, an Indo-European Caucasoid people of Inner Asia in antiquity, were also of Indo-Aryan origin.^[13]

The Proto-Indo-Iranians, from which the Indo-Aryans developed, are identified with the Sintashta culture (2100–1800 BCE),^[14][15] and the Andronovo culture,^{[citation needed]} which flourished ca. 1800–1400 BCE in the steppes around the Aral Sea, present-day Kazakhstan, Turkmenistan, and Uzbekistan. The Proto-Indo-Aryan split off around 1800–1600 BCE from the Iranians,^[16] moved south through the Bactria-Margiana Culture, south of the Andronovo culture, borrowing some of their distinctive religious beliefs and practices from the BMAC, and then migrated further south into the Levant and north-western India.^[17][5] The migration of the Indo-Aryans was part of the larger diffusion of Indo-European languages from the Proto-Indo-European homeland at the Pontic–Caspian steppe which started in the 4th millennium BCE.^[5][18][19] The GGC, Cemetery H, Copper Hoard, OCP, and PGW cultures are candidates for cultures associated with Indo-Aryans.

The Indo-Aryans were united by shared cultural norms and language, referred to as aryā 'noble'. Over the last four millennia, the Indo-Aryan culture has evolved particularly inside India itself, but its origins are in the conflation of values and heritage of the Indo-Aryan and indigenous people groups of India.^[20] Diffusion of this culture and language took place by patron-client systems, which allowed for the absorption and acculturation of other groups into this culture, and explains the strong influence on other cultures with which it interacted.

While the Indo-Aryan linguistic group occupies mainly northern parts of India, genetically, all South Asians across the Indian subcontinent are descendants of a mix of South Asian hunter-gatherers, Iranian hunter-gatherers, and Central Asian steppe pastoralists in varying proportion.^[21][22] Additionally, Austroasiatic and Tibeto-Burmese speaking people contributed to the genetic make-up of South Asia.^[23]

Indigenous Aryanism propagates the idea that the Indo-Aryans were indigenous to the Indian subcontinent, and that the Indo-European languages spread from there to central Asia and Europe. Contemporary support for this idea is ideologically driven, and has no basis in objective data and mainstream scholarship.^{[24][25][26][27][28]}