It is not likely that you will find all the articles you want in one database. For most research, it will be necessary to look in two or three databases to be sure you have found the appropriate materials.
Each database has its own search terms so it may be necessary to use different words to search for the same idea each time you start researching in a new database.
This link opens in a new windowIndexes research collections on microfilm related to subjects such as Exploration, Slavery, Indigenous Peoples, Literature and more.