Aryan Migration Theory (AMT) is established theory around anthropology circle about early habitation of Indian subcontinental (Known as South Asia). Aryan migration theory (AMT) is evolved form of Aryan Invasion Theory (AIT) which is recently rejected by many archaeologists based on artifacts available in the various ancient site, Sites of Harappa and Gangetic plane ancient sites. Now, we have established papers of Mr. Kumarsamy Thangarajan and Rakesh Tamang.
AMT suggest that early inhabited India migrated from Africa through south coastal dispersal. India was the leading center point of population dispersion throughout East Asia. The early migration suggested by the paper is around 50,000 YBP- 40,000 YBP. While the Island of Andaman and Nicobar was inhibited by people which are almost 65,000 YBP. Andamanis & Nicobaris people shared genes with people who are early inhabited to India southern coastal. It is suggested by the paper that this inhabitation in India could be after Toba eruption and before that, there was evidence of inhibited human species (maybe homo sapience because the stone technology was similar to homo sapience of Africa) near Narmada basin was dated back to around 300,000 to 250,000 YBP.
This theory predicts that India has two major groups in DNA structure.
ASI (Ancient South Indians) and ANI (Ancient North Indians) were the indigenous groups to India according to current population DNA structure mapping. This paper predicts that there might have two ancestral group in prehistoric India ANI which is distantly related to the Middle East, Central Asia and Europe (30% to 70%) while ASI has (30% to 70%) ANI ancestry. This group does not relate to Outside of India. Interestingly, Andaman Islanders are the only ASI group without ANI ancestry. It is also suggested that Indians ANI and ASI groups were the highly endogamous society in nature which helps to keep gene structure persevered so long.
Endogamy works as a barrier to the general perception about patrilocality and matrilocality. It is observed that there is the localization of male-specific Y chromosome variants and wide dispersal of female-specific mtDNA variants in patrilocality societies and vice versa. However Indian societies are was very rigid and endogamous in nature until today.
Dravidian and Dravid is the native speaker of Dravidian languages which is around 250 million people currently . These people mostly found in southern India from Andhra Pradesh, Orissa, Karnataka, Tamil & Karla. It is believed that they were early migrant than Central Asian Aryans while the study shows that ASI has 30% to 70% ancestry which means that ASI group was once also part of central Asia around 50,000-40,000 YBP. ASI groups disperse with south coastal land and settle down in near Gujrat. The slow dispersion of ANI was continued and consider to be long time dispersion from 3000 BCE to 1000 BCE into that group. After River system which is dried around the land of Gujrat and Indus valley, these groups disperse in three direction- North near Taxila formed civilization group Mohan Jodaro, Gangetic plains formed current North Indian culture and extreme south with current south Indian culture. While western and central India constantly approached by Mughal invaders and other tribes. ASI preserved their endogamy society. ANI was in constant mitigation with Invaders and tribes from the west.
After British come to India, the nasal index and race science used by western Indologist used by becoming benchmarks for caste system of India. Herbert Hope Risley  played an important role in forging these caste or endogamous societies into upper caste and lower caste. In His book, Tribes, and caste of Bengal, he used the ethnographical data based on nasal structure and language of Indian people. These caste system pockets become more rigid when administrative govt. of Britain promote these structure on job applications, higher studies etc. Before leaving India, Colonial power make sure that this ethnographical divide will continue so they introduce many theories based on Identity divide.
Politics Over Dravidian Identity
Post independent of India was the era of politically Identity. In this era, India faces the language wars from south India while caste war from North India. Just after First Prime Minister of India “Pundit Jawahar Lal Nehru” died. Indian politics have seen blow of unity of Indian Congress. Many party politicians opposed the low jobs and illiteracy inside schedule cast people while another side many south Indian parties oppose the use of Hindi in their state. The state (South Indian) was under the influence of reformers like Periyar and Dravidian scholar who wanted to separate themselves from North Indians. Periyar irrespective of brilliant reformer was infamous for his hate towards brahmins community.
Slowly these politics give birth to Dravida politics and Two parties formed from DMK (Dravida Munnetra Kazhagam) and All India Anna Dravida Munnetra Kazhagam (ADMK) based on Periyar ideology who was famous for his anti brahmins view.
In the recent political environment, the Dravidian identity shaping as the anti-Hindu attitude because of this fabricated Hindu divide by many western and Indian social scientist or NGO’s who been funded for such divide. The recent example is violence due to having Hindi name on Banglore Matero station. These violent protest registered as “Imposition of Hindi” (remember the protestor has no problem with colonial English) because of its suits the agenda of current state politics in general.
India still as a nation need more co-cohesiveness to glue each other for future. This identity and language politics and divide shall be marginalized. Victimisation based on identity shall be stoped to pursue the goal of political power.