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 Suba movement
The Punjabi Suba movement aimed at creation of a Punjabi-majority subah ("province") in the erstwhile East Punjab state of India in the 1950s. Led by the Akali Dal, it resulted in the formation of the Punjabi-majority Punjab state, the Haryanvi-Hindi-majority Haryana state and the Union Territory of Chandigarh. Some Pahari majority parts of the East Punjab were also merged with Himachal Pradesh as a result of the movement.