The nation's record keeper holds the records of the United States Federal government. You have online access to art works, census data, US legal manuscripts, the Federal Register and numerous other materials.
This is the definitive collection of everything the Smithsonian Museum has to offer. Search over 2 million records with images, video and sound files, electronic journals and other resources from the Smithsonian's museums, archives & libraries.
Introductions to different time periods are followed by essays by leading scholars; primary sources with images, transcripts, and a historical introduction; multimedia presentations by historians and master teachers; interactive presentations; and lesson plans and other classroom resources.
This website from the University of Missouri School of Law has chronologies, primary documents, and much more on many famous trials in history. While not all of these trials are from American history, most are and range from the Salem Witchcraft Trials, through John Brown, Scopes "Monkey," Mississippi Burning, Clinton Impeachment trials, and many more.
The National Women's History Museum researches, collects and exhibits the contributions of women to the social, cultural, economic and political life of our nation in a context of world history. They have quite a few in depth online exhibits on various topics in women's history.
This website from the Miller Center from the Univeristy of Virginia is a nonpartisan institute that seeks to expand understanding of the presidency, policy, and political history, providing critical insights for the nation's governance challenges.
BackStory is a public radio program & podcast that brings historical perspective to the events happening around us today. On each show, renowned U.S. historians tear a topic from the headlines and plumb its historical depths.