Culture is not a bi-product of history. India has 5000 years of history does not mean that all Indians have a 5000 year old history. Everyone on the earth can root his ancestors back to the beginning of evolution. The fact is it does not matter whether they were immigrants or natives or settlers or nomads. Besides, every society have been continuously evolving over the years.
Now, let us talk about Indus valley civilization. By all chances, the inhabitants of that civilization migrated from a place far away, prompted by their primitive instincts of survival. The fact that they were all migrated to a new land, does not mean that they did not have a culture, or their culture evolved 3000 years after their first settlement. If that was the case, today you wouldn't be boasting about the civilization that those settlers have found.
Sorry for being disrespectful here. I have grown up reading your essays. This post is just a disagreement with your article. Nothing more than that.
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-ജിതേഷ്, Seattle,