The United Kingdom has historically played a leading role in developing parliamentary democracy and in advancing literature and science. At its zenith in the 19th century, the British Empire stretched over one-fourth of the earth's surface. The first half of the 20th century saw the UK's strength seriously depleted in two world wars and the Irish Republic's withdrawal from the union. The second half witnessed the dismantling of the Empire and the UK rebuilding itself into a modern and prosperous European nation. As one of five permanent members of the UN Security Council and a founding member of NATO and the Commonwealth, the UK pursues a global approach to foreign policy. The Scottish Parliament, the National Assembly for Wales, and the Northern Ireland Assembly were established in 1998.

The UK has been an active member of the EU since its accession in 1973, although it chose to remain outside the Economic and Monetary Union. However, motivated in part by frustration at a remote bureaucracy in Brussels and massive migration into the country, UK citizens on 23 June 2016 narrowly voted to leave the EU. The UK is scheduled to depart the EU on 31 January 2020, but negotiations on the future EU-UK economic and security relationship will continue throughout 2020 and potentially beyond.

England: 27 two-tier counties, 32 London boroughs and 1 City of London or Greater London, 36 metropolitan districts, 56 unitary authorities (including 4 single-tier counties*);

two-tier counties: Buckinghamshire, Cambridgeshire, Cumbria, Derbyshire, Devon, Dorset, East Sussex, Essex, Gloucestershire, Hampshire, Hertfordshire, Kent, Lancashire, Leicestershire, Lincolnshire, Norfolk, North Yorkshire, Northamptonshire, Nottinghamshire, Oxfordshire, Somerset, Staffordshire, Suffolk, Surrey, Warwickshire, West Sussex, Worcestershire;

London boroughs and City of London or Greater London: Barking and Dagenham, Barnet, Bexley, Brent, Bromley, Camden, Croydon, Ealing, Enfield, Greenwich, Hackney, Hammersmith and Fulham, Haringey, Harrow, Havering, Hillingdon, Hounslow, Islington, Kensington and Chelsea, Kingston upon Thames, Lambeth, Lewisham, City of London, Merton, Newham, Redbridge, Richmond upon Thames, Southwark, Sutton, Tower Hamlets, Waltham Forest, Wandsworth, Westminster;

metropolitan districts: Barnsley, Birmingham, Bolton, Bradford, Bury, Calderdale, Coventry, Doncaster, Dudley, Gateshead, Kirklees, Knowlsey, Leeds, Liverpool, Manchester, Newcastle upon Tyne, North Tyneside, Oldham, Rochdale, Rotherham, Salford, Sandwell, Sefton, Sheffield, Solihull, South Tyneside, St. Helens, Stockport, Sunderland, Tameside, Trafford, Wakefield, Walsall, Wigan, Wirral, Wolverhampton;

unitary authorities: Bath and North East Somerset, Blackburn with Darwen, Bedford, Blackpool, Bournemouth, Bracknell Forest, Brighton and Hove, City of Bristol, Central Bedfordshire, Cheshire East, Cheshire West and Chester, Cornwall, Darlington, Derby, Durham County*, East Riding of Yorkshire, Halton, Hartlepool, Herefordshire*, Isle of Wight*, Isles of Scilly, City of Kingston upon Hull, Leicester, Luton, Medway, Middlesbrough, Milton Keynes, North East Lincolnshire, North Lincolnshire, North Somerset, Northumberland*, Nottingham, Peterborough, Plymouth, Poole, Portsmouth, Reading, Redcar and Cleveland, Rutland, Shropshire, Slough, South Gloucestershire, Southampton, Southend-on-Sea, Stockton-on-Tees, Stoke-on-Trent, Swindon, Telford and Wrekin, Thurrock, Torbay, Warrington, West Berkshire, Wiltshire, Windsor and Maidenhead, Wokingham, York;

Northern Ireland: 5 borough councils, 4 district councils, 2 city councils;

borough councils: Antrim and Newtownabbey; Ards and North Down; Armagh City, Banbridge, and Craigavon; Causeway Coast and Glens; Mid and East Antrim;

district councils: Derry City and Strabane; Fermanagh and Omagh; Mid Ulster; Newry, Murne, and Down;

city councils: Belfast; Lisburn and Castlereagh;

Scotland: 32 council areas;

council areas: Aberdeen City, Aberdeenshire, Angus, Argyll and Bute, Clackmannanshire, Dumfries and Galloway, Dundee City, East Ayrshire, East Dunbartonshire, East Lothian, East Renfrewshire, City of Edinburgh, Eilean Siar (Western Isles), Falkirk, Fife, Glasgow City, Highland, Inverclyde, Midlothian, Moray, North Ayrshire, North Lanarkshire, Orkney Islands, Perth and Kinross, Renfrewshire, Shetland Islands, South Ayrshire, South Lanarkshire, Stirling, The Scottish Borders, West Dunbartonshire, West Lothian

Wales: 22 unitary authorities;

unitary authorities: Blaenau Gwent, Bridgend, Caerphilly, Cardiff, Carmarthenshire, Ceredigion, Conwy, Denbighshire, Flintshire, Gwynedd, Isle of Anglesey, Merthyr Tydfil, Monmouthshire, Neath Port Talbot, Newport, Pembrokeshire, Powys, Rhondda Cynon Taff, Swansea, The Vale of Glamorgan, Torfaen, Wrexham

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The UK, a leading trading power and financial center, is the third largest economy in Europe after Germany and France. Agriculture is intensive, highly mechanized, and efficient by European standards, producing about 60% of food needs with less than 2% of the labor force. The UK has large coal, natural gas, and oil resources, but its oil and natural gas reserves are declining; the UK has been a net importer of energy since 2005. Services, particularly banking, insurance, and business services, are key drivers of British GDP growth. Manufacturing, meanwhile, has declined in importance but still accounts for about 10% of economic output.

In 2008, the global financial crisis hit the economy particularly hard, due to the importance of its financial sector. Falling home prices, high consumer debt, and the global economic slowdown compounded the UK’s economic problems, pushing the economy into recession in the latter half of 2008 and prompting the then BROWN (Labour) government to implement a number of measures to stimulate the economy and stabilize the financial markets. Facing burgeoning public deficits and debt levels, in 2010 the then CAMERON-led coalition government (between Conservatives and Liberal Democrats) initiated an austerity program, which has continued under the Conservative government. However, the deficit still remains one of the highest in the G7, standing at 3.6% of GDP as of 2017, and the UK has pledged to lower its corporation tax from 20% to 17% by 2020. The UK had a debt burden of 90.4% GDP at the end of 2017.

The UK economy has begun to slow since the referendum vote to leave the EU in June 2016. A sustained depreciation of the British pound has increased consumer and producer prices, weighing on consumer spending without spurring a meaningful increase in exports. The UK has an extensive trade relationship with other EU members through its single market membership, and economic observers have warned the exit will jeopardize its position as the central location for European financial services. Prime Minister MAY is seeking a new "deep and special" trade relationship with the EU following the UK’s exit. However, economists doubt that the UK will be able to preserve the benefits of EU membership without the obligations. The UK is expected to officially leave the EU by the end of March 2019.