American History and Culture Pathfinder

http://www.americanheritage.com/

http://americanhistory.si.edu/

http://www.multied.com/USHistory.html

http://www.usa.gov/Citizen/Topics/History_American.shtml

http://www.ashp.cuny.edu/who-we-are.html

http://memory.loc.gov/ammem/index.html 

(a little more complicated to search but good info on some topics)

http://www.pbs.org/wgbh/amex/teachers/index.html

(videos, etc.  May have to be accessed from a home computer)

http://www.fordham.edu/halsall/mod/modsbook.html

(Research topics from the green sidebar on the left-hand side)

http://www.digitalhistory.uh.edu/

http://www.archives.gov/