Flag ) Baluchistan States Union (combining Kalat, Kharan, Las Bela and Makran in 1953 – using flag of Kalat) Gwadar Enclave (purchased from Sultanate of Oman in 1958) One Unit of Pakistan 1955 Simmering tensions between the eastern and western wings of Pakistan led to the One Unit policy announced by Prime Minister Muhammad Ali Bogra. The states and provinces of the western wing merged in 1955 to become divisions of the new province of West Pakistan with the provincial capital at Lahore. At the same time, East Bengal became the new province of East Pakistan with the provincial capital at Dacca. West Pakistan annexed the former Omani enclave of Gwadar (on the Balochistan coast) in 1958 as part of Kalat division. In 1960 the federal government moved from Karachi to Rawalpindi (the provisional capital pending the completion of Islamabad), whilst the federal legislature moved to Dacca. The Federal Capital Territory was merged with West Pakistan in 1961 to form the new division of Karachi. In 1963 the Trans-Karakoram Tract was transferred by treaty from Gilgit Agency to China under the provision that the settlement was subject to the final solution of the Kashmir dispute. Thus from 1955 to 1970, Pakistan comprised two provinces: East Pakistan West Pakistan New provinces of Pakistan 1970 The One Unit policy was regarded as a rational administrative reform to reduce expenditure and eliminate provincial prejudices. However the military coup of 1958 signalled troubled times for the two-province system as the office of Chief Minister of West Pakistan was abolished by President Ayub Khan to be replaced by Governor's rule. Eventually, in 1970, the province of West Pakistan was dissolved by President Yahya Khan and four new provinces were created along with some changes in Pakistani Kashmir. These provinces combined most of the former provinces and states as follows: Changes after 1970 The province of East Pakistan became independent on December 16, 1971, as the new country of Bangladesh. The states of Hunza and Nagar were abolished and their territories merged into the Northern Areas in 1974. The Federally Administered Tribal Areas were formed from parts of the North West Frontier Province districts of Peshawar and Dera Ismail Khan in 1975. The status of the Islamabad area was changed to a capital territory in 1981. The names of two provinces were slightly modified in 1990 – Baluchistan became Balochistan and Sind became Sindh. In 2009,