27 Amendments Walkthrough | Constitution 101

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History & humanitiesConstitution 10123:30

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How are new amendments ratified to the Constitution? Jeffrey Rosen, president and CEO of the National Constitution Center, provides an overview of the amendment ratification process laid out in Article V and all 27 Amendments. Rosen explains the different periods of constitutional reform: the Founding Era (1791-1804), Reconstruction (1865-1870), the Progressive Era (1913-1920), and the Modern Era (1933-1992).

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