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The Charters of Freedom from the National Archives presents transcripts of the Declaration of Independence, the Constitution, and the Bill of Rights as well as high-resolution images of the documents. The page links to an article about the Constitution, a question-and-answer page, and a biographical index of the Founding Fathers.
Founding Fathers offers an e-text of the Federalist Papers, a collection of essays published in New York newspapers between 1787 and 1788 to help persuade the State's voters to ratify the proposed Constitution.
Cornell University's Law School Legal Information Institute offers an annoted Constitution.
The Bill of Rights Institute provides PDFs of some of the most important primary documents of the Revolutionary period. Among the documents are the Federalist Papers, Rights of the Colonists by Samuel Adams, and Common Sense by Thomas Paine.
The National Constitution Center's Interactive Constitution allows you to explore each article of the Constitution and provides an explation of their meaning. There are also options to explore the Constitution by topic and by Supreme Court decisions.
The U.S. Constitution section of the History Channel's website has articles, videos, speeches, photo galleries, and interactives about the Constitution and provides links to other History.com pages of people, themes, and events related to the Constitution.