"Economic geography" . "Sub-Saharan Africa" . "Urban development" . "Human migration" . "Diseases and disorders" . "Historical regions" . "Industrial Revolution" . "Geography of Africa" . "Global health" . "Urbanization" . "Foreign direct investment" . "Climate change mitigation" . "International macroeconomics" . "International business" . "Regions of Africa" . "Land use" . "International factor movements" .