There has always been slavery inside Africa.
(Sadly slavery is still in Africa today.)
Europeans sold goods that the kingdoms wanted.
The kingdoms kept pushing further and further into the interior.
This created a continuous cycle.
Whites were sold into slavery in Africa also.
(They were captured from barbery pirates in North Africa.)
Answer:
sedimtary rock, join my zo-om?
Explanation:
If around any highly populated city, or in fertile land, more profit.
I believe that the most likely answer is (D).
But, I can't shake that (E) is a possible answer.
Narrowed it down at the very least.
