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. 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