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.
Khalistan movement
In late 1930s and 1940s the Sikh leaders realized that Muslim Pakistan and a Hindu India were imminent. To make a case for a separate Sikh state within the Punjab, Sikh leaders started mobilizing meta-commentaries and signs to argue that Punjab belonged to Sikhs and Sikhs belong to Punjab. This began the territorialization of the Sikh community. The Muslim League's Lahore Resolution demanded a separate country for Muslims. A section of Sikh leaders grew concerned that their community would be left without any homeland following the partition of India between the Hindus and the Muslims. They put forward the idea of Sikhistan, envisaging it as a theocratic state covering a small part of the greater Punjab region. The country which he proposed would include parts of present-day Indian Punjab, Pakistani Punjab (including Lahore), and the Simla Hill States. It was imagined as a theocratic state led by the Maharaja of Patiala with the aid of a cabinet consisting of the representatives of other units. The idea was unviable due to lack of sufficient Sikh population as compared to other religions in Punjab.