America: History & Life - Major American and Canadian history indexing database that covers journal articles back to 1910.
Jstor - JSTOR is database that contains scholarly articles from all different disciplines and subject areas. Much of its content is available in full-text (although full-text of recent articles may not be available for a year or more).
Academic Search Premier - Multidisciplinary indexing/full-text database that covers scholarly journal articles.
More Databases by Subject: History
Boy and Women With a Saddle - Charles J. Belden Photographs, American Heritage Collection, Univ. of Wyoming