American and British History Resources maintained by Rutgers University Libraries hits all the high points of American and British history.
The American Civil War Home page has an extensive collection of what has already been written, transcribed and preserved concerning the American Civil War.
EuroDocs accesses primary historical documents from Western Europe.
In spite of the title, From Revolution to Reconstruction contains data collected by students and history buffs pertaining to US history from the colonial period to the 20th century.
The Historical Text Archive provides original material, links to other sites, and electronic reprints of books. HTA is organized by geography/nations and selected topics.
The History Central contains over 2500 links arranged by subject and name.
New American Studies Web accesses web-based resources in the file of American Studies, including American History.
Perseus Digital Library accesses primary source material in the areas of ancient Greek and Roman literature, archaeology, English Renaissance literature (Marlowe and Shakespeare), and California history.
Primary Source Documents Pertaining to Early American History accesses a massive collection of historical works which contributed to the formation of American politics, culture, and ideals.
Primary vs. Secondary Sources: What's the Difference? provides useful information on the difference between each source of information.
Yahoo - History provides links to selected history resources on the Web.