The United Kingdom is a unitary state under a constitutional monarchy. Queen Elizabeth II is the monarch and head of state of the UK, as well as fifteen other independent countries. These sixteen countries are sometimes referred to as "Commonwealth realms". The monarch has "the right to be consulted, the right to encourage, and the right to warn". The Constitution of the United Kingdom is uncodified and consists mostly of a collection of disparate written sources, including statutes, judge-made case law and international treaties, together with constitutional conventions. As there is no technical difference between ordinary statutes and "constitutional law", the UK Parliament can perform "constitutional reform" simply by passing Acts of Parliament, and thus has the political power to change or abolish almost any written or unwritten element of the constitution. No Parliament can pass laws that future Parliaments cannot change.
In the decades-long process of European integration, the UK was a founding member of the alliance called the Western European Union, established with the London and Paris Conferences in 1954. In 1960 the UK was one of the seven founding members of the European Free Trade Association (EFTA), but in 1973 it left to join the European Communities (EC). When the EC became the European Union (EU) in 1992, the UK was one of the 12 founding members. The Treaty of Lisbon, signed in 2007, forms the constitutional basis of the European Union since then.
More InfoAfter the end of the Second World War in 1945, the UK was one of the Big Four powers (along with the U.S., the Soviet Union, and China) who met to plan the post-war world; it was an original signatory to the Declaration of the United Nations. The UK became one of the five permanent members of the United Nations Security Council and worked closely with the United States to establish the IMF, World Bank and NATO. The war left the UK severely weakened, but it was spared the total war that devastated eastern Europe, and it depended financially on the Marshall Plan. In the immediate post-war years, the Labour government initiated a radical programme of reforms, which had a significant effect on British society in the following decades. Major industries and public utilities were nationalised, a welfare state was established, and a comprehensive, publicly funded healthcare system, the National Health Service, was created. The rise of nationalism in the colonies coincided with Britain's now much-diminished economic position, so that a policy of decolonisation was unavoidable. Independence was granted to India and Pakistan in 1947. Over the next three decades, most colonies of the British Empire gained their independence, with all those that sought independence supported by the UK, during both the transition period and afterwards. Many became members of the Commonwealth of Nations.
More InfoSettlement by anatomically modern humans of what was to become the United Kingdom occurred in waves beginning by about 30,000 years ago. By the end of the region's prehistoric period, the population is thought to have belonged, in the main, to a culture termed Insular Celtic, comprising Brittonic Britain and Gaelic Ireland. The Roman conquest, beginning in 43 AD, and the 400-year rule of southern Britain, was followed by an invasion by Germanic Anglo-Saxon settlers, reducing the Brittonic area mainly to what was to become Wales, Cornwall and, until the latter stages of the Anglo-Saxon settlement, the Hen Ogledd (northern England and parts of southern Scotland). Most of the region settled by the Anglo-Saxons became unified as the Kingdom of England in the 10th century. Meanwhile, Gaelic-speakers in north-west Britain (with connections to the north-east of Ireland and traditionally supposed to have migrated from there in the 5th century) united with the Picts to create the Kingdom of Scotland in the 9th century.
More InfoIn the 18th century, cabinet government developed under Robert Walpole, in practice the first prime minister (1721–1742). A series of Jacobite Uprisings sought to remove the Protestant House of Hanover from the British throne and restore the Catholic House of Stuart. The Jacobites were finally defeated at the Battle of Culloden in 1746, after which the Scottish Highlanders were brutally suppressed. The British colonies in North America that broke away from Britain in the American War of Independence became the United States of America, recognised by Britain in 1783. British imperial ambition turned towards Asia, particularly to India.
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