Punjab, Pakistan
The major and native language spoken in the Punjab is Punjabi (which is written in a Shahmukhi script in Pakistan) and Punjabis comprise the largest ethnic group in country. Punjabi is the provincial language of Punjab, but is not given any official recognition in the Constitution of Pakistan at the national level.
Punjabi Hindus
Because the Punjabi Hindus stated Hindi as their mother tongue (due to fear of sikh hegemony as Punjabi Hindus have Punjabi as their first language) in the censuses of 1951 and 1961, after the trifurcation, many areas being mostly Punjabi Hindu were given to Haryana and Himachal Pradesh, which made Punjab a Sikh-majority state in India.