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Head of state - Wikipedia
List of current heads of state and government - Wikipedia
President of the United States - Wikipedia
Head of state | Role, Powers & Responsibilities | Britannica
List of current heads of state and government - Simple English ...
Head of state - Simple English Wikipedia, the free encyclopedia
List of current state leaders by date of assumption of office - Wikipedia
Head of state - Oxford Reference
The Executive Branch | The White House
Head of government | Definition, Powers, Examples, Head of State ...
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