Partition and transition British India was partitioned into two independent
Dominions on 15 August 1947, the
Union of India and
Federation of Pakistan. India transitionally retained the British sovereign as its head of state until its continued membership in the
Commonwealth of Nations as a republic was agreed upon at the
1949 Commonwealth Prime Ministers' Conference. Indians continued to be British subjects until independent India enacted its own nationality legislation. Subjects of the princely states, who were previously considered British protected persons, became British subjects of India when their states
acceded to India. British subject status was reformed under the
British Nationality Act 1948. The Act abandoned the common nationality used across the Empire and redefined British subject to mean any citizen of a Commonwealth country. A
Commonwealth citizen was defined in this Act to have the same meaning. British subject/Commonwealth citizen status co-existed with the citizenship of each Commonwealth country. Because India had not enacted citizenship regulations by the time the 1948 Act took effect on 1 January 1949, Indians (and citizens of all other Dominions without citizenship laws) were provisionally classed as "British subjects without citizenship".
Republic and a national citizenship The citizenship provisions of the
Constitution of India came into force on 26 November 1949, in advance of the document's full effective date and the country's conversion into a republic on 26 January 1950. The partition resulted in large-scale population movements across the new borders separating India and
Pakistan. In this context, the
Constituent Assembly limited the scope of the Constitution's citizenship provisions for the immediate purpose of determining citizenship of these migrants. The Citizenship Act later enacted by Parliament in 1955 provides a full framework detailing citizenship requirements after that point. Any individual domiciled in India automatically became an Indian citizen in 1949 if they were: born in India, born to at least one parent who themself was born in India, or living in India for at least five years prior to the Constitution's commencement. Individuals of Indian descent living outside of the country could register for citizenship, but a person who had voluntarily acquired citizenship of a foreign state was barred from Indian citizenship. In this context, the definition of "foreign state" does not include Commonwealth member states. Persons who migrated from the area that became part of Pakistan could be registered as Indian citizens if they (or a parent or grandparent) were born in any part of pre-partition India as defined by the
Government of India Act 1935 and had either become domiciled in Indian territory before 19 July 1948, or had been registered as a citizen of India by Dominion officials after that date, but before commencement of the Constitution. Migrants from Pakistan were required to have been domiciled in India for at least six months prior to applying for registration. Conversely, persons who migrated from India to Pakistan and settled there at any time are not considered Indian citizens. Migration between
Nepal and India has been unrestricted since before a clear boundary existed between the two countries. While the British Indian government had encouraged Nepalese to settle in northeastern India to facilitate the growth of tea plantations in that area, high levels of migration between the two countries continued to occur due to cultural and religious similarities. Following Indian independence, the government negotiated a free movement agreement with Nepal that resulted in the 1950
Indo-Nepal Treaty of Peace and Friendship; all Indian and Nepalese citizens have since had the officially sanctioned ability to live and work in either country.
Commonwealth citizenship Commonwealth citizens initially continued to hold an automatic right to settle in the United Kingdom and
Ireland after 1949. Non-white immigration into the UK was systemically discouraged, but strong economic conditions in Britain following the Second World War attracted an unprecedented wave of colonial migration. In response, the British Parliament imposed immigration controls on any Commonwealth citizens originating from outside the
British Islands with the
Commonwealth Immigrants Act 1962. Ireland had continued to allow all British subjects free movement despite independence in 1922 as part of the
Common Travel Area arrangement, but moved to mirror Britain's restriction in 1962 by limiting this ability only to people born on the islands of
Great Britain or Ireland. Britain somewhat relaxed these measures in 1971 for patrials, subjects whose parents or grandparents were born in the United Kingdom, which gave effective preferential treatment to white Commonwealth citizens. Under the 1955 Citizenship Act, Commonwealth citizens were eligible to obtain Indian citizenship by registration in lieu of naturalisation, though there were no specific advantages to this method of acquisition. This pathway was available until Commonwealth citizen status was removed from Indian law in 2003. The UK itself updated its nationality law to reflect the more modest boundaries of its remaining territory and overseas possessions with the
British Nationality Act 1981, which redefined the term "British subject" to no longer also include Commonwealth citizens. Indian citizens remain Commonwealth citizens in British law and are still eligible to vote and stand for public office in the UK.
Integration of remaining colonies Remaining European colonial possessions in India were reintegrated by 1961. French-administered
Chandernagore held a referendum in 1949 resulting in the city's merger with
West Bengal, while the rest of
French India was relinquished by 1954.
Portuguese India was taken by force with two
military offensives in 1954 and 1961. Although most residents of these territories were given a choice between acquiring Indian citizenship and retaining their previous nationalities, those from
Dadra and Nagar Haveli were not. In
Goa, Daman and Diu, residents automatically became Indian citizens on 20 December 1961 unless they had made a written declaration before this date stating their intention to retain their existing nationality. Portugal did not recognise the annexation of its former Indian territories; persons born in applicable areas before 3 June 1975 were recognized as Portuguese citizens.
Accession of Sikkim The
Kingdom of Sikkim was an autonomous monarchy in northeastern India from the 17th century to 1975. Although Britain (and later India) had control over its foreign affairs, Sikkim was never considered a princely state and always held full autonomy over domestic matters. Sikkim lacked codified nationality legislation until 1961, when the Sikkim Subject Regulation came into force. This legislation initially defined Sikkim subjects as anyone of native ancestry with their permanent home in the country, or a person permanently settled in Sikkim who had cut all ties with their previous country or had acquired
real estate in Sikkim. Subject status was further restricted by a requirement to have held property rights in Sikkim before 1937, effectively barring a large number of Nepali residents from obtaining a permanent status in the country. Dual citizenship was prohibited and women automatically lost their rights as subjects on their marriage to non-Sikkimese men. The ethnic qualification to subject status was particularly unpopular, leading to a revolt and the repeal of the regulation in the following year. However, the 1962 amendment also created a facilitated naturalisation pathway for non-subjects of native ancestry; any person descended from a person domiciled in Sikkim before 1850 could apply for subject status even if they did not live in the country. After the
dissolution of Sikkim's monarchy and its accession to India in 1975, any person registered as a Sikkimese subject before 26 April 1975 became an Indian citizen. This process of acquisition left certain groups of people living in Sikkim
stateless including long-term residents without property, Sikkimese women who married non-Sikkimese, and individuals who had otherwise qualified for subject status but failed to complete registration before 1975.
Legislative responses to migration Indian nationality regulations were broadly permissive when they were first created at the time of the republic's founding. Successive governments since the 1980s have gradually increased the difficulty of acquiring Indian citizenship in response to changing patterns of immigration from neighbouring countries. Large-scale migration into
Assam from
Bengal began during colonial rule. British authorities encouraged workers from outside the region to resettle there to provide a continual source of labour for railway construction, agricultural development, and resource mining. The
National Register of Citizens for Assam was created in 1951 to maintain a central ledger of all citizens in the state as a result of local discontent towards the influx of migrants. Assam's population growth rate was substantially higher than the rest of India for the entire period between 1901 and 1981. The highest levels of migration occurred in the decade following the 1971
Bangladesh Liberation War; an estimated 1.8 million people settled in the state in the 1970s, compared to 221,000 in the 1950s and 424,000 in the 1960s. During a local election in 1979, a substantial portion of the enrolled electorate was discovered to be non-citizens. The ensuing backlash triggered the multi-year
Assam Movement, which demanded the expulsion of foreigners in the state. Protest organisers and government officials ultimately agreed on the
Assam Accord in 1985, which resulted in the addition of Section 6A to the Citizenship Act that same year. Under this change, any person who had been living in Assam prior to 1966 was an Indian citizen; those who settled there between 1966 and 1971 were removed from electoral rolls and subject to a 10-year waiting period before becoming eligible to register for citizenship. Migrants arriving after 1971 were all considered to have illegally immigrated. Ethnic conflict in neighbouring
Sri Lanka led to
civil war in 1983. Following the start of hostilities, about 100,000 people sought refuge in India. This event, combined with sustained unrest in Assam, led to another amendment to the Citizenship Act in 1986 that limited
citizenship by birth to children born to at least one Indian parent. A
further amendment in 2003 restricted that entitlement only to children with two Indian parents, or those with one parent who is a citizen and if the other is not considered an illegal migrant. Mandatory registration in the
National Register of Citizens for the entire country (contrasted with the register specific to Assam) was introduced in that year, as well as
overseas citizenship for the
Indian diaspora living abroad. Restrictions were selectively relaxed in 2019 for migrants from neighbouring countries belonging to certain religious groups who illegally entered India before 2015; persons from
Afghanistan,
Bangladesh, and Pakistan who are
Hindus,
Sikhs,
Buddhists,
Jains,
Parsis, or
Christians are not counted as illegal migrants for nationality purposes and are eligible for a reduced six-year residence requirement for naturalisation. The enactment of these changes sparked
widespread protests for countering the secular nature of earlier citizenship law. The National Register of Citizens for Assam was comprehensively updated in 2019, with every citizen in the state required to show proof of their citizenship and pre-1971 settlement. 1.9 million people failed to provide sufficient documentation and were not listed on the register, leaving them stateless and subject to deportation. == Acquisition and loss of citizenship ==