Databases grouped by subject. This should help you select appropriate collections based on your topic, however, keep in mind that usually topics are covered in overlapping disciplines. For example: If your research question is "Should the White House end a policy that bans abortion aid to victims in war zones?" you will find resources in HEALTH, but also in LAW, and RELIGION.
To cross-search all databases, select either ALL EBSCO or All ProQuest from the Databases A to Z list under the Research tab on the library's website. To search databases on specific subjects/disciplines, use the Subject Guides to find out what databases are licensed through the library.