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Presidential system - Wikipedia
presidency of the United States of America - Encyclopedia Britannica
9.2 What Is the Difference between Parliamentary and Presidential ...
President | Definition, Responsibilities, & History | Britannica
Presidency of the United States of America - Britannica
Presidential Systems | Encyclopedia.com
President of the United States - Wikipedia
Roles and powers of the president: lesson overview
Presidential System – Annenberg Classroom
What is the Presidential System?