Repressive regimes like that of Ethiopian Prime Minister Meles Zenawi (centre, after elections in 2010) have skilfully exploited ethnic diversity to their advantage by bestowing economic, political and employment benefits along ethnic lines. Photograph by: THOMAS MUKOYA REUTERS FILE PHOTO, Freelance

Repressive regimes like that of Ethiopian Prime Minister Meles Zenawi (centre, after elections in 2010) have skilfully exploited ethnic diversity to their advantage by bestowing economic, political and employment benefits along ethnic lines. Photograph by: THOMAS MUKOYA REUTERS FILE PHOTO, Freelance