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List of countries by system of government - Wikipedia
Mapped: The World’s Legal Government Systems - Visual Capitalist
Map of the World
World government - Wikipedia
Systems of Government List 2023: Presidents, Monarchies & More
Forms of Government, 2018 - National Geographic Society
Political Map of the World - Nations Online Project
Systems of Government by Country - ChartsBin
Political regime - Our World in Data
Government systems of the world - Vivid Maps