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List of European Union member states by political system
List of countries by system of government - Wikipedia
Politics of the European Union - Wikipedia
European Union (EU) | Definition, Flag, Purpose, History,
How Does the European Union Work? - Council on Foreign Relations
European Union - The World Factbook
CoR - France Introduction - Europa
POLITICAL ORGANISATION OF THE COUNTRIES OF THE EU - Learn Europe
The Political System of the European Union - Oxford Academic
Unitary, Confederal & Federal | Types of Government Systems