Majha
The partition split the Punjab Province (British India) into the two states of West Punjab (Punjab, Pakistan) and East Punjab. However, the historic Majha region is arguably still the same as before since the partition does not change the previous history of Punjab, therefore does not change the geography of the Majha region of the historic Punjab region.
Punjabi nationalism
Beside the fact that, in 1800 century, religious ratio of Punjabi people in Punjab was 48% Muslim Punjabis, 43% Hindu Punjabis, 8% Sikh Punjabis and 1% others, but due to attraction of the various tribes, castes and the inhabitants of the Punjab into a broader common "Punjabi" identity and uniting by natural affinity of "Punjabi Nationalism", Punjab was a secular regime, Punjabi was a secular nation and after throwing out the Muslim Mughal invaders of Punjab from Delhi, India and Muslim Afghan invaders of Punjab from Kabul, Afghanistan, a Sikh Punjabi, Maharaja Ranjit Singh was the ruler of Punjab, which provided the boost to the already initiated Punjabi nationalism.