[the demographic eastward shift of the Harappan population during the decline of their cities, i.e. an intra-Indian movement from Indus to Ganga,] “i… - Jim G. Shaffer

The shift by Harappan groups, and perhaps, other Indus Valley cultural mosaic groups, is the only archaeologically documented west-to-east movement of human populations in South Asia before the first half of the first millennium BC.

Unfortunately, there is an “academic status” associated with studying ancient states. Therefore, it is likely that either the “state” will be rede­fined to fit the “mature” Harappan pattern, or that “mature “Harappan culture will be moulded to the contours o f existing definitions, at the expense of exploring alternative explanations.

Shaffer (1993) refers to one set of data that undermines this simplistic portrayal of an apparent devolution and re-evolution of urbanization, which "has nearly become a South Asian archaeological axiom" (55). Although there appears to have been a definite shift in settlements from the Indus Valley proper in late and Post-Harappan periods, there is a significant increase in the number of sites in Gujarat, and an "explosion" (300 percent increase) of new settlements in East Punjab to accommodate the transferal of the population.

The modern archaeological record for South Asia indicates a history of significant cultural continuity; an intrepretation at variance with earlier eighteenth through twentieth-century scholarly views of South Asian cultural discontinuity and South Asian cultural dependence on Western culture influences.