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, India
In 1946, massive communal tensions and violence erupted between Punjab's Muslim majority and the Hindu and Sikh minorities. The Muslim League attacked the government of Unionist Punjabi Muslims, Sikh Akalis and the Congress and led to its downfall. Unwilling to be cowed, Sikhs and Hindus counterattacked, and the resulting bloodshed left the province in great disorder. Congress and League leaders agreed to partition Punjab along religious lines, a precursor to the wider partition of the country.