These databases index scholarly/academic journals. You may also find dissertations, conference proceedings, book reviews, magazine articles, and books among your search results, but each of these databases allows you to limit your results to academic journals.
Your research might intersect with additional subject areas, such as philosophy, literature, politics, medicine, and religion. The databases below are specialized subject databases indexing resources in disciplines that might relate to your topic. After searching the standard subject databases for history (listed above) you might also try searching for your topic in a secondary relevant subject database.