I don't know much about the history of Arya and Dravida:
I've heard that word Arya is found in Hindu Scripture (Veda) and Arya is related to Indus valley civilization while Dravida is related with south India.
For example, while reading the difference between Vadakalai & Thenkalai, I've found:
The Sri Vaishnava sect has its origins in the works of the Alwars, a group of 12 ancient Vaishnava saints who lived in Tamil Nadu and are famous for their poetry in praise of Vishnu. The 4000 poems of the Alwars were collected by Nathamuni into a book called the Naalayira Divya Prabhandam, which started being thought of as the Dravida Veda, or Veda of South India.
Manavala Mamunigal and his successors believed that words of the Alwars are of paramount importance, and that they contain all the important messages of the Vedas and more, so they started called themselves Thenkalai (the Southern group), because their supreme scripture was the Naalayira Divya Prabhanda, which is from South India. Vedanta Desikan and his successors still believed that Alwars' words were sacred, but they also thought that we shouldn't neglect the importance of Sanskrit scripture like the Vedas. Since they placed some emphasis on scripture that had come from North India, they became known as Vadakalai (the Northern group).
This implies that Sanskrit Vedas are related to North India.
In addition I've heard that Vedas are related to (originated by) Arya, while Aagama are related to (originated by) Dravida.
I'm looking for any historical/archaeological study carried out in order to know the ancient history.