Library databases such as Ebscohost and Proquest are used to find PEER-REVIEWED/SCHOLARLY JOURNAL ARTICLES, not found through Internet search engines (i.e. Google, Yahoo).
The material found within databases is generally more acceptable to use than material found on the web because it comes from professionals working in the field that you are researching. You still need to personally review material to make sure it is appropriate for your topic.
The following links will help you understand the peer review process and the difference between peer reviewed journals and magazines.
These databases are wider in scope and cover more than literature, providing citations for cultural studies, historical studies, political science, and other interdisciplinary topics.
Tip: add jstor.org or muse.jhu.edu to your search. For example, Whiskey Rebellion site:jstor.org or john brown and abolition site:muse.jhu.edu. If the full test is not available, you can request the article through interlibrary loan.