The Partition of Bengal in 1947, part of the Partition of India, divided the British Indian province of Bengal based on the Radcliffe Line between India and Pakistan. Predominantly Hindu West Bengal became a province of India, and predominantly Muslim East Bengal (now Bangladesh) became a province of Pakistan.
The partition enjoyed the support of most Hindu legislators in the Bengal Legislative Assembly, who voted for Hindu-majority western Bengal to be a part of India, instead of a Muslim majority undivided Bengal within Pakistan. Liberal Muslim leaders had earlier proposed an independent United Bengal, but met opposition from various parties, particularly Muslim and Hindu conservatives.
The partition, with the power transferred to Pakistan and India on 14–15 August 1947, was done according to what has come to be known as the "3 June Plan" or "Mountbatten Plan". India’s independence on 15 August 1947 ended over 150 years of British influence in the Indian subcontinent.
East Bengal, which became a province of Pakistan according to the provisions set forth in the Mountbatten Plan, later became the independent country of Bangladesh after the 1971 Bangladesh Liberation War.
In 1905, the first partition in Bengal was implemented as an administrative preference, making governing the two provinces, West and East Bengal, easier. While the partition split the province between West Bengal, in which the majority was Hindu, and the East, where the majority was Muslim, the 1905 partition left considerable minorities of Hindus in East Bengal and Muslims in West Bengal. While the Muslims were in favour of the partition, as they would have their own province, Hindus were not. This controversy led to increased violence and protest and finally, in 1911, the two provinces were once again united.
However, the disagreements between Hindus and Muslims in Bengal which had sparked the Partition of Bengal in 1905 still remained and laws, including the Partition of Bengal in 1947, were implemented to fulfill the political needs of the parties involved.