One Unit Scheme in the context of "North-West Frontier Province (1901–2010)"

The North-West Frontier Province (abbr. NWFP), commonly known as Sarhad (lit. 'Frontier'), was a province of Pakistan from 1947 to 1955 and from 1970 to 2010; and prior, a province of British India from its establishment in 1901 to Pakistan's independence in 1947. It was established from the north-western districts of British Punjab during the British Raj. Following the referendum in 1947 to join either Pakistan or India, the province voted hugely in favour of joining Pakistan and it acceded accordingly on 14 August 1947. It was dissolved to form a unified province of West Pakistan in 1955 upon promulgation of One Unit Scheme and was reestablished in 1970. It was known by this name until 19 April 2010, when it was dissolved and redesignated as the province of Khyber Pakhtunkhwa following the enactment of the Eighteenth Amendment to the Constitution of Pakistan.

The province covered an area of 70,709 km (27,301 sq mi), including much of the current Khyber Pakhtunkhwa province but excluding the Federally Administered Tribal Areas and the former princely states of Amb, Chitral, Dir, Phulra and Swat. Its capital was the city of Peshawar, and the province was composed of six divisions (Bannu, Dera Ismail Khan, Hazara, Kohat, Mardan, and Peshawar Division; Malakand was later added as the seventh division). Until 1947, the province was bordered by five princely states to the north, the minor states of the Gilgit Agency to the northeast, the province of Punjab to the east and the province of Balochistan to the south. The Kingdom of Afghanistan lay to the northwest, with the Federally Administered Tribal Areas forming a buffer zone between the two.

East Pakistan was the eastern province of Pakistan between 1956 and 1971, restructured and renamed from the province of East Bengal and covering the territory of the modern country of Bangladesh. Its land borders were with India and Burma, with a coastline on the Bay of Bengal. To distinguish this region from India's state West Bengal (which is also known as "Indian Bengal"), East Pakistan was known as "Pakistani Bengal". East Pakistanis were popularly known as "Pakistani Bengalis". In 1971, East Pakistan became the newly independent state Bangladesh, which means "country of Bengal" or "country of Bengalis" or "land of Bengalis" in the Bengali language. In standard meaning, "desh" refers to a country, but in Bangla local expressions, "desh" also means one's village or countryside, hometown, ancestral heritage, homeland, and they do not have to be a politically formed sovereign country.

East Pakistan was formed with West Pakistan at the reorganization of One Unit Scheme orchestrated by the 3rd prime minister of Pakistan, Mohammad Ali. The Constitution of Pakistan of 1956 replaced the Pakistani monarchy with an Islamic republic. Bengali politician H.S. Suhrawardy served as the Prime Minister of Pakistan between 1956 and 1957 and a Bengali bureaucrat Iskander Mirza became the first President of Pakistan. The 1958 Pakistani coup d'état brought general Ayub Khan to power. Khan replaced Mirza as president and launched a crackdown against pro-democracy leaders. Khan enacted the Constitution of Pakistan of 1962 which ended universal suffrage. By 1966, Sheikh Mujibur Rahman emerged as the preeminent opposition leader in Pakistan and launched the six-point movement for autonomy and democracy. The 1969 uprising in East Pakistan contributed to Ayub Khan's overthrow. Another general, Yahya Khan, usurped the presidency and enacted martial law. In 1970, Yahya Khan organised Pakistan's first federal general election. The Awami League emerged as the single largest party, followed by the Pakistan Peoples Party. The military junta stalled in accepting the results, leading to civil disobedience, the Bangladesh Liberation War, 1971 Bangladesh genocide and persecution of Biharis.

East Bengal (/bɛnˈɡɔːl/; Bengali: পূর্ব বাংলা/পূর্ববঙ্গ Purbô Bangla/Purbôbongo) was the easternmost and non-contiguous province of the Dominion of Pakistan, which covered the territory of modern-day Bangladesh. It consisted of the eastern portion of the British administrative Bengal province and the lion half of Sylhet district from the Assam province. East Bengal existed from 1947 until 1956, when it was re-structured as East Pakistan under the One Unit Scheme by the Constitution of Pakistan of 1956. East Bengal had a coastline along the Bay of Bengal to the south, and bordered India to the north, west, and east and shared a small border with Burma (presently known as Myanmar) to the southeast. It was situated near, but did not share a border with Nepal, Tibet, the Kingdom of Bhutan and the Kingdom of Sikkim. Its capital was Dacca, now known as Dhaka.

The Partition of India, which divided Bengal along religious lines, established the borders of the Muslim-majority area of East Bengal. The province existed during the reign of two monarchs, George VI and Elizabeth II; and three governors-general, Muhammad Ali Jinnah, Khawaja Nazimuddin and Ghulam Muhammad. Its provincial governors included a British administrator and several Pakistani statesmen. Its chief ministership was held by leading Bengali politicians.

Sind, sometimes spelled Scinde, was a province of Pakistan from 1947 till its amalgamation into West Pakistan in 1955; and prior, a province of British India from being granted provincial status in 1936 till Pakistan's independence in 1947. Karachi was the capital of the province till 1948, succeeded by Hyderabad.

Under the British, it encompassed the current territorial limits excluding the princely state of Khairpur. In 1948, Karachi was separated from the province to form the Federal Capital Territory and serve as the federal capital of Pakistan; this resulted in the provincial capital being shifted to Hyderabad. The province was dissolved alongside Baluchistan, the North-West Frontier Province, West Punjab, and a number of Pakistani princely states to form a unified province of West Pakistan in 1955, upon implementation of the One Unit Scheme.

Baluchistan was a chief commissioners province of British India established in 1876. Upon the creation of Pakistan it acceded to the newly formed state. It was part of the Baluchistan Agency. It was dissolved to form a united province of West Pakistan in 1955 upon the creation of One Unit Scheme.

West Punjab was a province in the Dominion of Pakistan from 1947 to 1955. It was established from the western-half of British Punjab, following the independence of Pakistan. The province covered an area of 159,344 km (61,523 sq mi), including much of the current Punjab province and the Islamabad Capital Territory, but excluding the former Princely state of Bahawalpur. Lahore, being the largest city and the cultural centre, served as the capital of the province. The province was composed of four divisions (Lahore, Sargodha, Multan and Rawalpindi) and was bordered by the state of Bahawalpur to the south-east, the province of Baluchistan to the south-west and Sind to the south, North-West Frontier Province to the north-west, and Azad Jammu and Kashmir to the north. It shared International border with Indian state of East Punjab to the east and Indian-administered Jammu & Kashmir to the north-east. It was dissolved and merged into West Pakistan upon creation of One Unit Scheme, in 1955.