While many of the journals available in the Mardigian Library will have relevant content, here are a few that specifically cover the topic:
African Diaspora
Journal of African Diaspora: Archaeology & Heritage
African and Black Diaspora: An International Journal
The Mardigian library has 1000's of journals, most of which are available online. Running other searches through the Mardigian Library catalog or through one of the subject specific databases will yield more results. Try multiple combinations of keywords and search terms to get different results. Also running a search through Summon searches all resources at the same time and the results can be qualified to display the type of resources you need.