<p>United States history:</p>
<p>[Digital</a> History](<a href=“http://www.digitalhistory.uh.edu/database/hyper_titles.cfm]Digital”>http://www.digitalhistory.uh.edu/database/hyper_titles.cfm)
[American</a> History [ushistory.org]](<a href=“http://www.ushistory.org/us/]American”>Redirection)
[US</a> History - Wikibooks, open books for an open world](<a href=“http://en.wikibooks.org/wiki/US_History]US”>US History - Wikibooks, open books for an open world)</p>