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First human race to migrate to India directly from Africa was Australoid race. Second human race to migrate to India was Iranian neolithic people(not same as present Iranians, present Iranians are mix of Anatolian farmer and some steppe pastorals.) Third human race to migrate from west was bmac(south central asian bronze age civilization) people, they were mix of Iranian neolithic people, Siberian hunter gatherer and Anatolian farmer. Fourth race to migrate from west was steppe pastorals which we considers as aryan, highest admixture of steppe is in jats and lowest is in paniya. Out of jat region brahmins have highest steppe in India. From north and east there was migration of mongoloid race whose admixture can be seen in Ladakh, Himachal, Uttrakhand, Sikkim, Bengali, Assamese and north east Indian people. The presence of many races is the reason why we see thousand of community in India and so much linguistic diversity too. In stone age there was no country and human was free to roam around, it was agricultural revolution which changed human who was nomad hunter gatherer into settled being and tribes started to form on the basis of race, occupation and cultural beliefs. Here are summary of genetic detail of different communities of india:- Dalits, south Indians and Baniya are australoid shifted communities Kamboj and Khatri are most bmac shifted communities Gujjar is most Iran neolithic shifted community Jat is most steppe shifted community Jat is least australoid admixture carrying community of India Paniya is highest australoid admixture carrying community of India India is so diverse that Jat from north India are genetically closer to Udmurt of Russia than Maratha of southern India, reason for such distance is Maratha have low steppe admixture and high australoid admixture while jats have high steppe admixture and low australoid admixture, Maratha are not even most australoid community, Dalits of north India(except Punjab) are more australoid community than Marathas.
