West Punjab
At Independence there was a Muslim majority in West Punjab with significant Hindu and Sikh minority. Nearly all of these minorities left West Punjab for India, to be replaced by large numbers of Muslims fleeing from the opposite direction. The official language of West Punjab was Urdu but most of the population spoke Punjabi using the Shahmukhi script. The linguist George Abraham Grierson in his multi volume Linguistic Survey of India (1904–1928) considered the various dialects up to then called "Western Punjabi", spoken in North, West, and South of Lahore in what is now Pakistani Punjab, as constituting instead a distinct language from Punjabi. (The local dialect of Lahore is the Majhi dialect of Punjabi, which has long been the basis of standard literary Punjabi.) Grierson proposed to name this putative language "Lahnda", and he dubbed as "Southern Lahnda" the coherent dialect cluster now known as Saraiki spoken in Multan Dera Ghazi Khan and Bahawalpur division and "North Lahnda" now known as Potwari spoken in Rawalpindi division and "Western Lahnda" now known as Hindko spoken in the regions bordering Khyber-Pakhtunkhwa.
Punjabi nationalism
In the 19th century, due to politics of congress, dominated by the Hindi speaking, UP-ite Hindu leaders of UP, CP, Hindu Punjabi's started to prefer the Hindi language instead of Punjabi by declaring the Hindi as a language of Hindus and started to become clones of Gunga Jumna culture and traditions with the loss of their own Punjabi identity. Later on, Muslim Punjabi’s did the same and started to become the clones of Gunga Jumna culture and traditions with the loss of their own Punjabi identity, because of preferring the Urdu language upon Punjabi by declaring the Urdu as a language of Muslims, due to the influence of the Muslim League, dominated by the Urdu speaking, UP-ite Muslim leaders of UP, CP and presence of UP-ite Muslims in Punjab.