About 15,000 B.C. increasing population pressure throughout Turkestan and Iran occasioned the first really extensive Andite movement toward India, slowly moving southward into the Deccan. [1]
As the Salem missionaries penetrated southward into the Dravidian Deccan, they encountered an increasing caste system, the scheme of the Aryans to prevent loss of racial identity in the face of a rising tide of the secondary Sangik peoples. [2]
The Aryans made very little racial impression on India except in the northern provinces. In the Deccan their influence was cultural and religious more than racial. [3] Hinduism became contaminated with a flood of degrading and debilitating cults and creeds from the Deccan. [4] Dravidian culture has survived in Deccan to modern times. [5]