The most appropriate way to connect European states proved to be the model of integration through supranational communities, and then through their own "union", in which member states transfer part of their sovereignty to supranational bodies of the Community, but retain their statehood and identity. Until then, the usual way of connecting states through international treaties proved to be too uncertain and non-binding a form of cooperation in the face of the challenges of the modern globalized world. In the analysis of the legal system of the European Union, the most important are its three components that make it an independent legal entity sui generis. These are the legal principles on which it is based, the legal acts on which it is based, and the regulatory powers or competencies of the bodies that create and implement the same system. As the legal system of the European Union is a supranational legal system, its legal nature and functioning are defined in contrast to the internal legal system of the Member States. Thanks to the supremacy of the Union's rights over the national rights of states, greater, faster and better protection of individual rights of all in the Union has been enabled, and will therefore certainly contribute to greater legitimacy of the Union in the eyes of its citizens.