History of the United Kingdom
The United Kingdom started to become a unified nation with the political union of the kingdoms of England (which already included Wales) and Scotland in 1707 in accordance with the Treaty of Union. The Union created the United Kingdom of Great Britain, which was ruled by a single monarch and parliament in London. In 1800 a further Act of Union saw the joining of the Kingdom of Ireland to create the United Kingdom of Great Britain and Ireland. In 1922 and following the Anglo-Irish Treaty, Ireland split from the United Kingdom of Great Britain and Ireland to become the Irish Free State, a dominion of the British Empire but a day later, Northern Ireland split from the Free State and rejoined the United Kingdom. As a result, in 1927 the United Kingdom changed its formal title to the "United Kingdom of Great Britain and Northern Ireland.
