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They rely on Natural Resourses
Yes.75% of African countries have specialized economies today - they depend on exporting one or two products.
developing nation african countries are still developing
The obstacles that slowed progress toward democracy for some African nations was civil war, military rule, or corrupt dictators.
oil
Sucking my dick too much
If a nation is developing they need to build up the country. There are more rural areas without advanced technology to mass produce products. Most developed nations have more industrial economies because they have the money and resources to do so.
Economic Growth, High Population, Poor Development, Corruption
When businesses have a competitive advantage, then others will look to them to perform the work in international business. This will help improve the economies of developing nations.
High unemployment rates is the major problem challenging many African nations today. Which has resulted in a number of social problems, since Africa has a large youthful population.
Because the white colonialists raped the once prosperous continent of it's resources, and left the left the newly independent African nations with an infrastructure designed to fail, so that imperialist nations of the west could maintain control.
Tariffs are often created to protect infant industries and developing economies, but are also used by more advanced economies with developed industries. Read more in the related link.