There are a lot of good fighters, who dont get the atention they deserve. a lot of african nations have good boxing culture South Africa Nigeria Ghana Angola
Ghana hands down...only Nigerian fighter of note who didn't turn into a letdown by going crazy or fat was Dick Tiger.
NIGERIA!!!! MY people.. but I'd stilll have to go with South Africa... best African fighter today is Sakio Bika.. but he might not claim Cameroon (not sure).. then I would say Joseph Agbeko (who probably should be my first honestly).. then Mzonke Fana and Nkosinathi Joyi btoh from South Africa.... so that's Cameroon, Ghana, and two South Africans....
Recent history? Ghana, no doubt. All-time? I have no idea, not that well-versed in African boxing of the early 20th century.