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 language
When Pakistan was created in 1947, although Punjabi was the majority language in West Pakistan and Bengali the majority in East Pakistan and Pakistan as whole, English and Urdu were chosen as the national languages. The selection of Urdu was due to its association with South Asian Muslim nationalism and because the leaders of the new nation wanted a unifying national language instead of promoting one ethnic group's language over another. Broadcasting in Punjabi language by Pakistan Broadcasting Corporation decreased on TV and radio after 1947. Article 251 of the Constitution of Pakistan declares that these two languages would be the only official languages at the national level, while provincial governments would be allowed to make provisions for the use of other languages. However, in the 1950s the constitution was amended to include the Bengali language. Eventually, Punjabi was granted status as a provincial language in Punjab Province, while the Sindhi language was given official status in 1972 after 1972 Language violence in Sindh.