It gave them things to trade with other countries and themselves in order to establish kingdoms
The world's population today is much larger than it has been in anytime in the history of the world, and has been continuing to grow ever since the Industrial Revolution, since this raised the living standards and increased in incomes of an enormous number of people, especially in the western world. Advances in medicine have also played a major role.
B
(sorry if it is wrong, i tried)
I think is B because most prejudice in the US Were black
Answer: Soil in Sub Saharan Africa is poor because
a) it is often overworked and undernourished
b) farmers sometimes don't have enough money to maintain it
Hope this helps!