Topic summary
Federal union

Extracted from the Wikipedia article Federation.
European Union
The European Union (EU) is a sui generissupranational union of sovereign member states. Its constitutional character has no universally accepted classification. Scholars have variously analysed the EU using theories of federalism, characterised it as a federation or federal union of states, or argued that its legal order remains fundamentally international rather than federal. It is therefore commonly described as a sui generis political and legal union.