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Head of government - Wikipedia
Head of government | Definition, Powers, Examples, Head of …
List of current heads of state and government - Wikipedia
President of the United States - Wikipedia
The Executive Branch | The White House
Head of government - Oxford Reference
US Officers: Who Are Our Government Leaders? | USAFacts
Executive Branch: President, Vice President, and The Cabinet
Executive Branch - HISTORY
Branches of the U.S. government | USAGov