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.
Punjab, Pakistan
In the 1950s there was tension between the eastern and western halves of Pakistan. To address the situation, a new formula resulted in the abolition of the province status for Punjab in 1955. It was merged into a single province West Pakistan. In 1972, after East Pakistan seceded and became Bangladesh, Punjab again became a province.