Lewis Henry Morgan (Lawyer/Amerindian Anthropologist 1851-1881), noticed a peculiarity between the Amerindians and Tamil Indians. Though separated by the vast swathe of land and ocean in between, yet having a commonality surprised him. He began to study the Iroquois and Tamil connections systematically. Initially, he had his theory that all humans descended from a common source. He is also of the opinion that Native Americans originated in Asia. To substantiate his theory, he started comparing the kinship of the Iroquois to different groups of people across the globe. The closest match is with the Tamil tribes of South India.This theory gained momentum when he gathered the necessary information from his visiting friend Dr. Henry Scudder of the American missionary at the Arcot of Tamil Country.
His seminal work gives rise to many possibilities for the Tamil researchers to undertake systematic research to establish the connection between the Amerindian tribes and their Tamil connections. What he observed is that the kinship of the Tamil tribes of south India has striking similarities to that of the Native Americans. Following the footsteps of Morgan, Australian researchers Patrick McConvell and Helen Gardner, who studied Australian Aboriginals conclude that it is likely that the Dravidianate/Kariera system is original and basic, and the cross-parallel neutralisation which is happening in the Australian Aboriginals are an ‘overlay’.
In this conclusion, the Dravidianate/Kariera system can be interpreted as a Tamil system, if you read the J. H Mcilvaine address titled the Life and Work of Lewis H Morgan L.L. D, an address at his funeral (1881 50-51). I wish the younger generation of Tamils who are studying at various universities around the globe could take Lewis Henry Morgan's assertions seriously and undertake comparative studies on Tamils' kinship system and consanguinity.