Relationship of water system and civilization?

Question

what maybe the difference or the relationship between water system and the civilization of Africa?

kindly discuss the answer.

Thanks a lot.

Answer 1

The difference is that the water in the US is actually consumable.

Answer 2

Most of the ancient civilizations flourished along the banks of big rivers.Likewise,the civilizattion over Egypt in the Africa flourished along the banks of the river Nile.

Rivers also contribute to water system.