Because of such migration ,one finds the remains, influence of Sanatan Dharm throughout the world.
Tamil Classics also speak of Kanchi,and the Sangam Literature calls it as Kanchi Mudur,Ancient Kanchi.( The Term Mudur is used only for two cities (Mudur),Madurai and Kanchi).
These two cities are quite ancient if one goes through these references.
A Brahmin from Kanchi founded Cambodia Vietnam Thailand
Kanchi tribe is mentioned in the Mahabharata Thus,
There was a Dravida Civilization in the South before or started with Manu in the south of Vindhyas,
The tribes of Dravidas were left behind by Manu when he left for Ayodhya,
Sage Vasista stayed in the South,
Later when Viswamitra banished his sons to the south, Dravida civilization was in existence during the Ramayana period,
Dravidians were called as Dasyus because of their way of Life was different from Sanatana Dharam though they followed the Sanatana Dharma.
These Dravidian tribes included the ancestors of Greeks, other European tribes, Chinese and Huns.
genetic lineage study demolishes this theory and proves that gypsies known as Romanis actually are descendants of Domas who have inhabited the Gangetic plain for centuries now,”