This website is a collection of manuscripts, letters, maps, printed pamphlets, etc. ranging from 1943 through the present time. This site seems to mainly focus on the Revolution, Civil War, and Reconstruction eras. One nice feature for educators is their unit lessons on popular historical events in history. Each unit is provided with visual aids, primary sources, and other learning tools associated with the topic. 

This website's main focus is centered on the history and culture of California and the role it played in national and world history. Calisphere includes photographs, diaries, recorded oral history, cultural artifacts, documents, etc. I feel this is a great resource, even for teachers not living in California, because of the variety of information presented and the prevalence of primary and secondary sources of our nation's history. 

The Internet History Sourcebook is a collection of historical, modern, medieval documents, maps, primary and secondary sources, literature resources, and bibliographies. This is a great resource that covers a very large span of history and information. The only downside to this site is that it has very few images.  

Colonial Williamsburg online is a great resource for information on life in the 18th century, ranging from people, place, trades, etc. They have a feature where you can tour the town of Colonial Williamsburg in 3D and experience audio, video, photography, and other features of the town. The Colonial Williamsburg site also has biographies, essays, articles, and other primary resources from Americans on their day-to-day living in the 18th century.

Harvard provides web-accessible collections consisting of journals, manuscripts, government documents, microform, music scores, and recordings. There is a great deal of information through the Harvard Libraries both online and in person. 

Even though this is not an American affiliated site, the British Library has excellent resources for educators.  I enjoyed the variety of tools and resources it had to offer.  One particular area that I enjoyed exploring was their "Timelines: Sources from History" that allows you to explore collection items from ancient civilizations to the present day.  There was also this one section pertaining to a century of children's songs, rhymes and games, which presented children's culture in Britain over the years. I found this to be very intriguing because I did not expect to see a special area designated only for children's games of the past. In addition to explaining these games there were also curriculum links highlighting drama, history, art, citizenship, etc. 

This site is a department of the Library Congress that consists of online collections, virtual exhibits, and webcasts of American history and culture. This would be a great resource for students to explore America's past. 

The Smithsonian Collections has a vast collection of objects, documents, photos, etc. ranging from ancient civilizations to current historical events. According to the Smithsonian website there are "7.4 million digital records available online through the Collections Search Center." This site would be a great resource for students when searching for primary documents. 

The National Archives is the collection of U.S. Government documents and records that are important to preserve for generations to come. There is a great section for teachers that include everything from lesson plans and activities, primary source research and resources, and state and regional resources. 

Federal Resources for Educational Excellence or FREE, is a U.S. Department of Education website that complies free teacher resources from dozens of federal agencies.  Subjects range from: arts and music, history and social studies, health, language arts, math, and science.