The Library of Congress – The Nation’s Library
http://www.loc.gov/index.html

The National Archives – America’s Guardian of Significant Documents
http://www.archives.gov/

Calisphere - University of California's free public gateway to a world of primary sources
http://www.calisphere.universityofcalifornia.edu/

The U.C. Davis History Project “Professor Rolland Marchand” Collection
http://marchand.ucdavis.edu/

Harper's Weekly
http://www.harpweek.com/
Electronic access to Harper’s Weekly, the illustrated 19th century "Journal of Civilization" from 1857-1912.  HarpWeek's electronic database makes it possible for the user to discover the lively news stories, illustrations, cartoons, editorials, biographies, literature, and even advertisements that shaped and reflected public opinion in this era.

The Gilder Lehrman Institute for American History
http://www.gilderlehrman.org/ 
The Gilder Lehrman Institute of American History promotes the study and love of American history. The Institute serves teachers, students, scholars, and the general public. The collection contains more than 60,000 documents detailing the political and social history of the United States. The collection's holdings include manuscript letters, diaries, maps, photographs, printed books and pamphlets ranging from 1493 through modern times.

Western History and Genealogy Digital Image Collection
http://history.denverlibrary.org/images/about.html
The collection chronicles the people, events, and places that shaped the settlement and growth of the Western frontier.

Authentic History: Primary Sources from American Popular Culture
http://www.authentichistory.com/
The Authentic History Center is comprised of images of artifacts and historic sounds from American popular culture. 

California Digital Newspaper Collection
http://cdnc.ucr.edu/
The California Digital Newspaper Collection offers over 150,000 pages of California newspapers spanning the years 1849-1911 freely available to the public. Current newspapers available include the Alta California (1849-1889); the San Francisco Call (1900-1910); the Amado Ledger (1900-1911); the Imperial Valley Press (1901-1911); and the Los Angeles Herald (1905-1907).

The KCSOS/KCM TAH Project has provided links below to some of the most frequently used web sites that provide instructional strategies, historical resources and professional development opportunities.  Do you have a great link for history instructional strategies? If so, send it to jabrouillette@kern.org.  

Smithsonian National Museum of American History
http://americanhistory.si.edu/
The National Museum of American History creates learning opportunities, stimulate imaginations, and present challenging ideas about our country’s past.  Our web site offers online exhibitions, behind-the-scenes glimpses into our collections, and an overview of Museum programs and activities.

Teaching American History.org
http://teachingamericanhistory.org/
A project of the Ashbrook Center for Public Affairs at Ashland University.  The web site offers connections to historical documents, professional development seminars, audio lectures and special exhibits. 

Digital History
http://www.digitalhistory.uh.edu/
This materials on this Web site include a US history textbook; over 400 annotated documents from the Gilder Lehrman Collection, supplemented by primary sources on slavery, Mexican American, Asian American, and Native American history, and US political social, and legal history; and more

A Biography of America
http://www.learner.org/biographyofamerica/index.html
A Biography of America is a telecourse and video series that presents American history as a living narrative. This series web site lets you delve further into the topics of the 26 video programs.  For each program you'll find an interactive feature related to the subject or the time period of the program.

Historical Maps of the United States
http://sunsite.informatik.rwth-aachen.de/Maps/histus.html
The collections of the University of Texas Libraries are the result of more than one hundred years of continuing commitment by librarians, faculty, students, and private donors to build one of the great library collections of the world.

Eyewitness: History through the eyes of those who lived it
http://www.eyewitnesstohistory.com/index.html
Your ringside seat to history - from the Ancient World to the present. History through the eyes of those who lived it, presented by Ibis Communications, Inc. a digital publisher of educational programming.