Question: When did the country Harrysong comes from become a federation of 19 states?

full_context: Document 1: Mid-Western Region, Nigeria: It was formed in June 1963 from Benin and Delta provinces of the Western Region, and its capital was Benin City. It was renamed a province in 1966, and in 1967 when the other provinces were split up into several states, it remained territorially intact, becoming a state.
Document 2: Harry Styles: Harry Edward Styles (born 1 February 1994) is an English singer, songwriter, and actor. He rose to stardom as a member of the boy band One Direction. Styles grew up in Holmes Chapel, Cheshire, where he performed as a singer with his band White Eskimo. In 2010, Styles auditioned as a solo artist for the British music competition series The X Factor, where he and four other contestants joined to form One Direction. One Direction have since released five albums, performed four worldwide tours, and won several awards. One Direction went on an extended hiatus in January 2016.
Document 3: Federal government of Nigeria: The Federal Government of Nigeria is the federal government for the Federal Republic of Nigeria, a federation in West Africa, composed of 36 states, who share sovereignty with the federal government and 1 federal territory administered solely by the federal government. The federal government is composed of three distinct branches: legislative, executive, and judicial, whose powers are vested by the Constitution of Nigeria in the National Assembly, the President, and the federal courts, including the Supreme Court, respectively.
Document 4: States of Nigeria: Date Events Map 1960 - 1963 At the time of independence in 1960, Nigeria was a Federal State of three Regions: Northern, Western, and Eastern. Additionally, provinces, which were a legacy of colonial times, remained extant until they were abolished in 1976. 1963 - 1967 In 1963, two provinces were detached from the Western Region to form the new Mid-Western Region. 1967 - 1976 In 1967, the regions were replaced by 12 states due to a military decree; only the former Mid-Western Region escaped division, and formed a single state following the restructuring. From 1967 to 1970 the areas of Mid-Western State and the Eastern Region attempted to secede, as a nation called Biafra during the Nigerian civil war. 1976 - 1987 In 1976, seven new states were created, making 19 altogether. 1987 - 1991 During this period, there were 21 states and later, Abuja, the Federal Capital Territory. 1991 - 1996 During this period, there were 30 states and the Federal Capital Territory. The Federal Capital Territory was established in 1991. In 1987 two new states were established, followed by another nine in 1991, bringing the total to 30. The latest change, in 1996, resulted in the present number of 36 states.
Document 5: Rag'n'Bone Man: Rory Charles Graham (born 29 January 1985), better known as Rag'n'Bone Man, is an English singer - songwriter. His first hit single ``Human ''was released in 2016 and his debut album, also named Human, was released in February 2017. At the 2017 Brit Awards he was named British Breakthrough Act and also received the Critics' Choice Award.
Document 6: Menlo Park (band): It featured Harper Simon, Paul Simon's son. Also, its drummer was Seb Rochford, who won the BBC Rising Star Jazz Award in 2004 and leads the Mercury Prize-nominated experimental-jazz group Polar Bear.
Document 7: Nigeria: Modern-day Nigeria has been the site of numerous kingdoms and tribal states over the millennia. The modern state originated from British colonial rule beginning in the 19th century, and the merging of the Southern Nigeria Protectorate and Northern Nigeria Protectorate in 1914. The British set up administrative and legal structures whilst practising indirect rule through traditional chiefdoms. Nigeria became a formally independent federation in 1960, and plunged into a civil war from 1967 to 1970. It has since alternated between democratically-elected civilian governments and military dictatorships, until it achieved a stable democracy in 1999, with its 2011 presidential elections being viewed as the first to be conducted reasonably freely and fairly.
Document 8: Sonu Nigam: Sonu Nigam was born on 30 July 1973 to Agam Kumar Nigam and Shobha Nigam, in the city of Faridabad, Haryana. His father was from Agra and his mother was from Garhwal. His sister Teesha Nigam is also a professional singer.Nigam began his singing career at the age of four, when he joined his father Agam Kumar Nigam on stage to sing Mohammed Rafi's song "Kya Hua Tera Wada". Nigam began accompanying his father on his singing appearances at weddings and parties. He moved to Mumbai with his father to begin his Bollywood singing career at the age of 18. He was trained by Hindustani classical singer Ustad Ghulam Mustafa Khan.Nigam married Madhurima Mishra on 15 February 2002. He has a son named Nevaan.
Document 9: History of Nigeria: In 1914, the area was formally united as the Colony and Protectorate of Nigeria. Administratively, Nigeria remained divided into the Northern and Southern Provinces and Lagos Colony. Western education and the development of a modern economy proceeded more rapidly in the south than in the north, with consequences felt in Nigeria's political life ever since. Following World War II, in response to the growth of Nigerian nationalism and demands for independence, successive constitutions legislated by the British Government moved Nigeria toward self - government on a representative and increasingly federal basis. On 1 October 1954, the colony became the autonomous Federation of Nigeria. By the middle of the 20th century, the great wave for independence was sweeping across Africa. On 27 October 1958 Britain agreed that Nigeria would become an independent state on 1 October 1960.
Document 10: Member states of the Organisation of Islamic Cooperation: Nigeria -- Federal Republic of Nigeria Capital: Abuja A 1986 A 7008178517000000000 ♠ 178,517,000 A 7005923768000000000 ♠ 923,768 A English (hide) Further details Nigeria is a federation of 36 states and 1 federal territory.
Document 11: Singing Melody: Everton Hardweare (born 23 November 1967), better known by his stage name Singing Melody, is a Reggae artist from Kingston, Jamaica. He is known for his abilities as a vocalist, his production work and for combining aspects of Reggae and R&B in his own releases.
Document 12: Harrysong: Harrison Tare Okiri, better known by his stage name Harrysong, is a Nigerian singer, songwriter and instrumentalist who rose to fame after his tribute song to Nelson Mandela won the "Most Downloaded Callertune Award" at The Headies 2013. Harrysong was born in Warri, Delta State, Nigeria to Ijaw parents but moved to Lagos in 2007 after spending some of his early life in Port Harcourt. Prior to signing to QuestionMark Entertainment, Harrysong used to perform at night clubs until he met Kcee who introduced him to top music personalities. In 2014, Harrysong was nominated in the "Best Pop/R&B Artist of the Year" category at the 2014 Nigeria Entertainment Awards after the release of his chart-topping song "Beta Pikin".
Document 13: Mode 9: Babatunde Olusegun Adewale(born June 14, 1975), popularly known by his stage name Modenine, is an English-born Nigerian rapper.In 2014, he released a song titled "Super Human" with Jamaican-American rapper Canibus.
Document 14: Southampton: The city is home or birthplace to a number of contemporary musicians such as R'n'B singer Craig David, Coldplay drummer Will Champion, former Holloways singer Rob Skipper as well as 1980s popstar Howard Jones. Several rock bands were formed in Southampton, including Band of Skulls, The Delays, Bury Tomorrow, Heart in Hand, Thomas Tantrum (disbanded in 2011) and Kids Can't Fly (disbanded in 2014). James Zabiela, a highly regarded and recognised name in dance music, is also from Southampton.
Document 15: Nigeria: Nigeria is divided into thirty-six states and one Federal Capital Territory, which are further sub-divided into 774 Local Government Areas (LGAs). The plethora of states, of which there were only three at independence, reflect the country's tumultuous history and the difficulties of managing such a heterogeneous national entity at all levels of government. In some contexts, the states are aggregated into six geopolitical zones: North West, North East, North Central, South East, South South, and South West.
ground_truth: 1976
sub_queries: Where was Harrysong from? Answer: Nigeria
when did Nigeria become a federation of 19 states Answer: 1976