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Initially, the Schengen implementing Convention (signed only by Belgium, France, Germany, Luxembourg and the Netherlands) was based on intergovernmental cooperation in the field of justice and home affairs. the Agreement proper of 14 June 1985, and the Convention implementing the Schengen Agreement, which was signed on 19 June 1990 and entered into force on 26 March 1995. The key milestone in establishing an internal market with free movement of persons was the conclusion of the two Schengen agreements, i.e. The Lisbon Treaty confirmed this right, which is also included in the general provisions on the Area of Freedom, Security and Justice. It is this EU citizenship that underpins the right of persons to move and reside freely within the territory of the Member States. The Treaty of Maastricht introduced the notion of EU citizenship to be enjoyed automatically by every national of a Member State. The first provisions on the subject, in the 1957 Treaty establishing the European Economic Community, covered the free movement of workers and freedom of establishment, and thus individuals as employees or service providers. The concept of the free movement of persons has changed in meaning since its inception. Legal basisĪrticle 3(2) of the Treaty on European Union Article 21 of the Treaty on the Functioning of the European Union (TFEU) Titles IV and V of the TFEU Article 45 of the Charter of Fundamental Rights of the European Union. Notwithstanding the importance of this right, substantial implementation obstacles persist. The gradual phasing-out of internal borders under the Schengen agreements was followed by the adoption of Directive 2004/38/EC on the right of EU citizens and their family members to move and reside freely within the EU. Freedom of movement and residence for persons in the European Union is the cornerstone of EU citizenship, established by the Treaty of Maastricht in 1992.