Say for example, due to lack of interest, popularity, or language problems, but historians still acknowledge the topic itself as important. Another question is if so, what other language has a disproportional amount of academia on this subject? That is aside from the native language, which other language has the most studies on the subject besides English?
East Asia and Africa are two big ones.
African history, for sure. Particularly sub-Saharan Africa. Of course, sources can be hard to find there in any language, but they are there, and undervalued if you ask me.