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This is a verp apt question. The reason is simple. Climate-geography dictated small populations that were disjointed along tiny chiefdoms. In fact the population of the indus Basin remain pretty low and disconnected until the british arrived and created huge irrigation colonies making much of modern Punjab which could support the armies they raised. Modern Pakistan even more then India is a British creation.
Not that gora haters would accept this litle fact. Take away the British irrigation colonies and British heritage Pakistan military a few tribes from Waziristan could still lay waste the entire basin and even reach Delhi.
Atleast u bothered to answer with reasons.
But then, what u say is true for western part of Conterminous Pakistan only,, while the land east of indus was almost always conjoined with northern India,and had considerable resources n population,,, and that is exactly what is baffling,,,, north Indians plus east of indus Pakistan was easy peasy for every other invader.
If u look at oldmaps Pakistan was always under occupation. Any competent race will at the very least give tough time to invaders(like Afghanistan,, low on resource, less population, minimal fertile land) but look at bhayya people total subjugation in front of everyone.
What is more disturbing is the fact that plenty of Pakistani posters take that eternal bending over as somthng to be proud of.
As if the dead referred to in the name hindukush r not Pakistani but some migrant hindus from namilnadu or assam who were doing zulm on thm
Even after getting a whole moutain named after the incompetence n total failure of thr ancestors,,,getting shafted by everyone left n right.