Question: What country is the county that Dennis Walker was born located?

full_context: Document 1: Hackney (parish): Hackney was a parish in the historic county of Middlesex. The parish church of St John-at-Hackney was built in 1789, replacing the nearby former 16th-century parish church dedicated to St Augustine (pulled down in 1798). The original tower of that church was retained to hold the bells until the new church could be strengthened; the bells were finally removed to the new St John's in 1854. See details of other, more modern, churches within the original parish boundaries below.
Document 2: Duncan Edwards: Born in Woodside, Dudley, Edwards signed for Manchester United as a teenager and went on to become the youngest player to play in the Football League First Division and at the time the youngest England player since the Second World War, going on to play 18 times for his country at top level. In a professional career of less than five years he helped United to win two Football League championships and two FA Charity Shields, and reach the semi-finals of the European Cup.
Document 3: Capita: Capita was formed 1984 as a division of the non-profit CIPFA (Chartered Institute of Public Finance and Accountancy). In 1987 it became an independent company with 33 staff as a result of a management buy - out, led by Rod Aldridge, and was first listed on the London Stock Exchange in 1991.
Document 4: Ambit Energy: Ambit Energy is an International multi-level marketing company that provides electricity and natural gas services in energy markets in the U.S. that have been deregulated.The company's corporate headquarters are located in Dallas, Texas, and its operations/call center headquarters are located in Plano, Texas. Ambit Energy was founded in 2006 in Addison, Texas by Jere Thompson Jr. and Chris Chambless.
Document 5: Hackney Empire: The Hackney Empire is a theatre on Mare Street, in the London Borough of Hackney, built in 1901 as a music hall.
Document 6: All-Hallows-the-Great: All-Hallows-the-Great was a church in the City of London, located on what is now Upper Thames Street, first mentioned in 1235. Destroyed in the Great Fire of London of 1666, the church was rebuilt by the office of Sir Christopher Wren. All-Hallows-the-Great was demolished in 1894 when many bodies were disinterred from the churchyard and reburied at Brookwood Cemetery.
Document 7: Ben Underwood (footballer): He was born in Alfreton, Derbyshire and began playing with Newton Rangers before joining New Hucknall Colliery. After a brief spell with Sutton Town, Underwood signed for Derby County, but made no first-team appearances, and went on to play League football for Doncaster Rovers, where he made 105 appearances in competitions. He moved to Leeds United, only managing to break into the first team for a few matches, before going on to Coventry City for two seasons.
Document 8: Roy Keane: Keane initially found life in Nottingham difficult due to the long periods away from his family, and he would often ask the club for a few days' home leave in order to return to Cork. Keane expressed his gratitude at Clough's generosity when considering his requests, as it helped him get through his early days at the club. Keane's first games at Forest came in the Under-21s team during a pre-season tournament in the Netherlands. In the final against Haarlem, he scored the winning penalty in a shootout to decide the competition, and he was soon playing regularly for the reserve team. His professional league debut came against Liverpool at the start of the 1990–91 season, and the resulting performance encouraged Clough to use him more and more as the season progressed.
Document 9: Capita: It is the largest business process outsourcing and professional services company in the UK, with an overall market share of 29% in 2016, and has clients in central government, local government and the private sector. It also has a property and infrastructure consultancy division which is the fourth largest multidisciplinary consultancy in the UK. Roughly half of its turnover comes from the private sector and half from the public sector. Whilst UK-focused, Capita also has operations across Europe, Africa and Asia.
Document 10: Cape plc: Cape plc is a United Kingdom energy services company based in West Drayton, Middlesex. It was acquired by Altrad in September 2017.
Document 11: Dennis Walker (footballer): Born in Hackney, Walker made his Manchester United debut against Nottingham Forest on 20 May 1963 and became United's first ever black player. He joined York City the following year.
Document 12: St Anne and St Agnes: St Anne and St Agnes was rebuilt by Sir Christopher Wren in 1680, with possible contributions from Robert Hooke. The small brick church is of an unusual design in London, being based on that of a Greek cross; it utilises a vaulted square within a square, a formula based on the Nieuwe Kerk in Haarlem in the Netherlands. Wren also used a similar design at St Martin Ludgate and St Mary-at-Hill. The parish was united with the parish of St John Zachary by Act of Parliament in 1670 as St John's was not rebuilt after the Great Fire.
Document 13: Peter Ndlovu: On 19 August 1992, Peter Ndlovu made history by being the first African footballer to play in the new English Premier League. Having acquired the legendary striker Micky Quinn in November 1992 they continued what had already been a blistering start, with away wins at Tottenham Hotspur (2 -- 0) Sheffield Wednesday (2 -- 1) and Wimbledon (2 -- 1) to add to already impressive home wins against Middlesbrough (2 -- 1). By the early autumn the Sky Blues briefly topped the inaugural Premier league and would only lose five league games prior to Christmas. The addition of Micky Quinn to the squad led to further outstanding home wins against Aston Villa (3 -- 0) and Liverpool (5 -- 1). In February 1993, they won 4 - 2 against title chasing, big spending Blackburn Rovers. However, a barren final few weeks of the season and a run in that would see back to back games against Man Utd, Liverpool, Chelsea and Leeds Utd saw them slip from fifth in the league in February to 15th in the final table. The season finished with a thrilling performance from Ndlovu in a 3 -- 3 draw against Leeds Utd. Ndlovu was a key component throughout the season in Gould's fast pacey front line which included John Williams, Kevin Gallacher (until his departure to Blackburn) and Robert Rosario, who formed a worthy partnership with Micky Quinn. Peter Ndlovu's goal against Norwich City, in a 1 -- 1 draw in late September, was a signature piece of Ndlovu flair which earned him the Match of Day 'Goal of the month' competition.
Document 14: Cascade AIDS Project: Cascade AIDS Project (CAP) is a nonprofit organization based in Portland, Oregon, in the United States. Its mission is to prevent HIV infections, to "support and empower" people affected and by HIV/AIDS, and to eliminate stigma associated with the disease. Founded in 1983 and incorporated two years later, CAP is the "oldest and largest community-based provider of HIV services, housing, education and advocacy" in Oregon and Southwest Washington.
Document 15: Hackney, Guyana: Hackney, is a village in Guyana, standing on the eastern bank of the Pomeroon River, 11 km from its mouth. Formerly the business centre for residents of the coconut estates of the lower Pomeroon River, Hackney is still of some importance. It provides a primary school and church for residents of the surrounding area.
ground_truth: United Kingdom
sub_queries: Dennis Walker >> place of birth Answer: Hackney
Hackney >> located in the administrative territorial entity Answer: Middlesex
Middlesex >> country Answer: United Kingdom