This megasite brings together federally-funded resources for teaching U.S. history. Most of these resources boast large collections of primary sources from the Library of Congress, the Smithsonian, the National Archives and Records Administration, and prominent universities.

There are more than 600 websites listed for U.S. history alone, divided by time period and by topics, such as: Business & Work; Ethnic Groups; Famous People; Government; States & Regions; and Wars. While most of these websites are either primary source archives (for example, History of the American West, 1860–1920) or virtual exhibits contextualizing primary source collections, many offer lesson plans and ready-made student activities, such as EDSITEment, created by the National Endowment for the Humanities.

A good place to begin is the Site Map, that lists resources by subtopic, including African Americans (67 resources), Women's History (37 resources), and Natural Disasters (16 resources). Each resource is accompanied by a brief annotation that facilitates quick browsing.