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Presidential system - Wikipedia
President of the United States - Wikipedia
presidency of the United States of America - Encyclopedia Britannica
What is the Presidential System?
Presidential Government - Encyclopedia.com
presidents of the United States - Encyclopedia Britannica
Presidential System Definition, Overview & Function - Lesson
President | Definition, Responsibilities, & History | Britannica
Presidential System – Annenberg Classroom
Presidents, vice presidents, and first ladies - USAGov