As an archive of scholarly journals, this database includes a large set of history journals. Remember that it is an archive - articles published in 1950 may still be relevant, but they also may have been challenged/ made obsolete/ etc.
The primary database for indexing history profession journals. Started indexing journals in 1955 and covers world history from 1450 to the present. However, if you are doing anything witha global aspect, don't forget the related database Historical Abstracts.
This broad database can be searched by cited reference (in other words, who has been using the seminal work you've found) and because of it's scope may provide more articles that are relevant to your topic. This is also useful for ancient history.