The land of Punjab was always thus. I recall reading TI (?) IIRC about similar descriptions of the land of the 5 rivers in the Mahabharata. Whatever we're seeing in the Punjab today on both sides of the Radcliffe line is a recent phenomenon not even 2 centuries old initiated since British times.
The latter had also begun plans for digging canals which eventually became the canal colony settlements turning Punjab especially west or what's now Paxtani Punjab into the bread basket of India.
The choice itself was no coincidence. Since the 1857 war of independence , the British learnt their lessons quickly & saw the population there as mostly loyal particularly the Sikhs & the Punjabi Musalmans who also served as the catchment areas for foot soldiers in the Royal Indian Army as opposed to the Purabiyas who were directly responsible for the events of 1857 .
A bonus move was to award agricultural lands to ex servicemen which were mostly tax free (?) thus securing their loyalties even beyond retirement. Incidentally Punjabi Hindus were barred from recruitment as per the martial race theory itself a BS theory for when have Punjabi Musalmans ever exhibited any martial prowess .
If they did they wouldn't be Musalmans to begin with . Since recruitment as per the martial race theory was restricted to Sikhs & Muslims , a lot of what were otherwise Hindu Jats & non Jats converted to Sikhi in order to be able to enlist .
IIRC TI also did a thread on this phenomenon a long time ago on Twitter. Apparently a very small percentage of the Sandhu Jats were Sikhs then. An overwhelming majority of them were Hindu with a small minority Muslim & Sikh. The martial race theory saw this clan convert mostly to Sikhi . This was also true of a few other clans of Jat & non Jat Hindu origin .
What this did to the demographic balance there & the repercussions of this move on the Khalistani movement today can well be imagined & these events are not even 150 years old.
This move served to reward one section of the populace while condemning another section to destitution & poverty. Post independence India also saw governments follow the same route to boosting economic prosperity while neglecting the Indo Gangetic plains.
Results are before our eyes.