Use the digital library Questia School to supplement the library's book collections.
If you need to access databases from home, logon to Moodle where the username/password combinations may be found at the Library/Upper School link.
For peer reviewed articles, choose Academic Search Premier.
An extensive archive of peer reviewed scholarly journals.
For peer reviewed articles, check the box marked "scholarly articles."
Like JStor, Muse is an extensive archive of scholarly journals that also includes access to e-books.
U. S. History in Context
Good beginning point!