became a minority government in 2007 and then went on to win an overall majority of MSPs at the 2011 Scottish parliament elections and forms the current Scottish Government administration. In a 2014 referendum on independence 44.7% of voters voted for independence versus 55.3% against. In Northern Ireland, Irish nationalist parties such as Sinn Féin advocate Irish reunification. In Wales Plaid Cymru support Welsh independence. The constitution of the United Kingdom is uncodified, being made up of constitutional conventions, statutes and other elements. This system of government, known as the Westminster system, has been adopted by other countries, especially those that were formerly parts of the British Empire. The United Kingdom is also responsible for several dependencies, which fall into two categories: the Crown Dependencies, in the immediate vicinity of the UK, are strictly-speaking subject to the Crown (ie, the Monarch) but not part of the sovereign territory of the United Kingdom (though de facto British territory), and British Overseas Territories, as British colonies were re-designated in 1983, which are part of the sovereign territory of the United Kingdom, in most of which aspects of internal governance have been delegated to local governments, with each territory having its own first minister, though the title used may differ, such as in the case of the Chief Minister of Gibraltar, though they remain subject to the Parliament of the United Kingdom (when United Kingdom is used to refer only to that part of the British Realm, or sovereign British territory, which is governed directly by the British Government, and not via local subsidiary governments, United Kingdom logically refers to a local government area, though the national government performs the role of local government within that area). History Treaty of Union agreed by commissioners for each parliament on 22 July 1706. Acts of Union 1707, passed by both the Parliament of England and the Parliament of Scotland to form the Kingdom of Great Britain. Act of Union 1800, passed by both the Parliament of Great Britain and the Parliament of Ireland to form the United Kingdom of Great Britain and Ireland. Government of Ireland Act 1920, passed by the Parliament of the United Kingdom and created the partition of Ireland. The republican southern part of Ireland became Republic of Ireland (also known as Éire), leaving Northern Ireland part of the union. The Accession of the United Kingdom to the European Communities (EC) took