After India gained independence in 1947, the province of Bengal was partitioned along religious lines. The western part remained in India (and was named West Bengal) while the eastern part joined newly formed Pakistan as a province called East Pakistan (later giving rise to Bangladesh in 1971). At the time of its creation in 1947, the state of West Bengal was divided into 14 districts—Bankura, Birbhum, Burdwan, Calcutta (Kolkata), Darjeeling, Jalpaiguri, Hooghly, Howrah, Malda, Midnapore, Murshidabad, Nadia, West Dinajpur and 24 Parganas. Cooch Behar district was a princely state named Koch Bihar till 20 August 1949, when the state formally agreed to join India. Transfer of administration was started on 12 September 1949 and was completed on 19 January 1950, when Cooch Behar became a district of West Bengal. Chandannagar, which was earlier part of the French India, had voted to join India in a plebiscite in 1949. Formally, it joined India in 1952 and finally became a part of the Hooghly district of West Bengal on 2 October 1954. The States Reorganisation Act of 1956 reorganised boundaries of the Indian states along linguistic lines. As this act was implemented, the then West Dinajpur district was enlarged with the addition of some areas from Bihar, and the Purulia district was formed on 1 November 1956 from parts of the Manbhum district of Bihar.
