Thank goodness you said overpopulation of a developing country is 'one' of its major problem because corruption is the major problem of a developing country. For a country like Nigeria blessed with mineral resources, so abundant that if properly utilized, the rate of poverty as a result of overpopulation would have been on the low. Though Nigeria is the most populated black nation in the world and the most populated in Africa, mismanagement of funds is the major problem been faced. The GDP keeps rising as the population keeps increasing.