American Cultural History: The 19th Century - http://kclibrary.lonestar.edu/19thcentury.html
A decade, by decade discussion of social issues such as social movements, literature, and immigration with links to the 20th century.
American Life Histories - http://memory.loc.gov/ammem/wpaintro/wpahome.html
Manuscripts from the Federal Writers' Project, 1936-1940. The Library of Congress collection includes 2,900 documents representing the work of over 300 writers from 24 states. The stories can also be found in the print collection at KCLS.
Constitution of the United States - http://www.archives.gov/historical-docs/document.html?doc=3&title.raw=Constitution%20of%20the%20Unit
Includes scanned images of the original documents and biographies of the delegates who signed the Constitution.
Famous Trials - http://www.law.umkc.edu/faculty/projects/ftrials/ftrials.htm
Famous American and world trial, with decisions and appeals.
History Channel - http://www.historychannel.com/
A quick way to find out about 'This Day in History' in the automotive, civil war, crime, literary, technology, wall street, and world war II venues from 1850 to the present.
Information Gateway - http://www.lib.washington.edu/subject/history/web.html
University of Washington's web starting points for exploring history by geographic regions and topics with many links.
July 4th: Celebrating Independence Day in the US - http://usinfo.state.gov/usa/holidays/july4
The following articles and photos illuminate aspects of U.S. history and values, and provide a snapshot of some of the diverse ways in which Americans have celebrated the Fourth of July." Includes links to related government documents. Some material also in Spanish. From the U.S. Department of State's Bureau of International Information Programs.