Re: History of Pakistan since 3000 BC
Christopher Colombus did not reach the American mainland until his third voyage in 1498. So are you saying that America or that land did not exist before then? Pakistan or the piece of land that now constitutes Pakistan (call it A, B, C or Pakistan, but it's the same land) has existed ever since the creation of earth. 5000 year's history is what we know about. If anything we know very little about our history.
You are mixing up geography and history.
History of a land mass is different from that of a country. Land mass changes over millions of years, countries change in hundreds or less years!
If you are saying that Pakistan is simply renaming of a particular piece of real estate and nothing more it would be wrong since the Pakistan of 1947 is not Pakistan on 1972 even by real estate criteria.
To be a country there has to be some sort of governing structure. That did not exist before 1947. Hence my view that 'history' cannot be before that. Now if you think origins, anthropology etc, that is different.