The oil fields would enable Germany to fuel their air forces, making them harder to defeat.
Some Africans captured in wars were sold to European traders by other Africans. Many were captured but died of disease or starvation before arriving. The Transatlantic slave trade profoundly diminished Africa’s prospective to develop economically and uphold its social and political stability.
Socially, the biggest impact the Trans-Atlantic slave trade had on West Africa was a decrease in their population.
You should be able to call someone to do it for you and they should give you a price when you call.