http://www.doe.virginia.gov/testing/sol/released_tests/2007/test07_ushistory_1877-present.pdf

http://www.ourdocuments.gov/content.php?flash=true&page=milestone

http://www.americaslibrary.gov/cgi-bin/page.cgi/jb

http://apusnotes.nfshost.com/timeline/presidents2

http://www.potus.com/

http://www.harcourtschool.com/ss1/Grade5/grade5c.html

Animated Atlas

http://www.animatedatlas.com/timeline.html

http://www.worldmapper.org/