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Presidential system - Wikipedia
presidency of the United States of America - Encyclopedia Britannica
Presidency of the United States of America - Britannica
How the president is elected | USAGov
President of the United States - Wikipedia
Roles and powers of the president: lesson overview
President | Definition, Responsibilities, & History | Britannica
United States presidential election - Wikipedia
Presidential System – Annenberg Classroom
10.4 Advantages, Disadvantages, and Challenges of Presidential …