American Centuries http://www.americancenturies.mass.edu
American Memory at the Library of Congress http://www.memory.loc.gov
Bill of Rights Institute http://www.billofrightsinstitute.org
Common Sense by Thomas Paine http://www.ushistory.org/paine/commonsense/index.htm
Discovering Justice http://www.discoveringjustice.org
Gettysburg Address http://memory.loc.gov/cgi-bin/query
Gilder Lehrman Institute of American History http://www.gilderlehrman.org
History Matters http://www.historymatters.gmu.edu/
The Historical Society http://www.bu.edu/historic/
John Locke's Second Treatise on Government http://www.liberty1.org/2dtreat.htm
League of Women Voters http://www.lwv.org
Liberty Fund http://www.libertyfund.org
Library of Congress http://www.loc.gov
Massachusetts Council on Economic Education http://www.economiced.org
Massachusetts Geographic Alliance http://www.massgeo.org
The Narrative of the Life of Frederick Douglass: An American Slave http://www.history.rochester.edu/class/douglass/duglas11.txt
National Archives' Digital Classroom http://www.archives.gov/digital_classroom/index.html
National Council for History Education http://www.history.org/nche
National Geographic http://www.nationalgeographic.com
National History Day http://www.nationalhistoryday.org
Smithsonian Institutions http://www.si.edu
U.S. History http://www.ushistory.org
White House Historical Association http://www.whitehousehistory.org
New American Studies http://www.georgetown.edu/crossroads/asw/