A major justification for supporting a system of public schools has been the promotion of a general diffusion of civic knowledge necessary for a well-informed citizenry. America's founders, hoping to "secure the Blessings of Liberty to ourselves and our Posterity," knew that our system of ordered liberty would endure only if its citizens understood the nation's guiding principles. The endurance of American liberty, the founders believed, depends upon a broad knowledge of the nation's history and an understanding of its institutions.