European Union representation within those institutions, a practice often referred to as "pooling of sovereignty". To become a member, a country must meet the Copenhagen criteria, defined at the 1993 meeting of the European Council in Copenhagen. These require a stable democracy that respects human rights and the rule of law; a functioning market economy; and the acceptance of the obligations of membership, including EU law. Evaluation of a country's fulfilment of the criteria is the responsibility of the European Council. No member state has yet left the Union, although Greenland (an autonomous province of Denmark) withdrew in 1985. Article 50 of
Kingdom of León present, León is composed of the provinces of León, Zamora, and Salamanca, is now part of the autonomous community of Castile and León within the modern Kingdom of Spain. Political parties representing "Leonesismo", the Leonese regionalist and nationalist movements, support the creation of an autonomous community separate from Castile. Leonesist parties gained 13.6% of votes cast in the León autonomic elections in 2007. There have also been initiatives approved by some Leonese city councils to establish a NUTS-2 (European Statistical Region) for León. Kingdom of León The Kingdom of León (, ; ; Astur-Leonese: "Reinu de Llïón"; ; ; ;