To be precise, ‘current studies of the transition between the two early urban civilizations claim that there was no significant break or hiatus.’ - Jonathan Mark Kenoyer

The Vedic peoples discriminated against the Dasa, a group of people who spoke a different language that did not sound at all like Sanskrit. The Brahmins sometimes made fun of the Dasa and said that they spoke as if they had no noses. (Pinch your nose and see what you would sound like.) The Dasa had wide flat noses and long curly black hair, and the Brahmins claimed that they had darker skin and called them uncivilized barbarians, who didn’t know how to behave…. The Dasa had, in reality lived in the region for hundreds of years. Their ancestors in the Indus Valley were the Harappans who had named the rivers and mountains, and had built the cities that now lay abandoned.

The dating of glass in the Indus Valley and northern India, between 1900 and 1700 BC suggests that this industry was becoming common in all three regions at about the same time. ...No analysis of the recently discovered Late Harappan glass has been undertaken, but the styles of beads and the presence of a highly developed faience industry suggests that the Indus glass technology was an indigenous development.

Although the overall socioeconomic organization changed, continuities in technology, subsistence practices, settlement organization, and some regional symbols show that the indigenous population was not displaced by hordes of Indo-Aryan speaking people. . . . For many years, the "invasions" or "migrations" of these Indo-Aryan-speaking Vedic/ Aryan tribes explained the decline of the Indus civilization and the second rise of urbanization. . . . This was based on simplistic models of culture change and an uncritical reading of Vedic texts. Current evidence does not support a pre- or proto-historic Indo-Aryan invasion of southern Asia. . . . Instead, there was an overlap between Lite Harappan and post-Harappan communities . . . with no biological evidence for major new populations.