What three empires in western africa flourished because of the trans-saharan trade fo gold and salt?

Ghana, Mali, Songhai are the three empires in western Africa that were flourished because of the trans-Saharan trade of gold and salt.

Explanation:

Ghana: Gold mining led Ghana to grow into a powerful kingdom. Gold mining was the major contribution to the Ghana economy. Iron was another important factor in the development of the Ghana kingdom, as it was used in making tools and weapons.

Mali: Mali is the landlocked country in West Africa. Mali had control over both the gold trade and salt trade.

Songhai: Songhai was made up of the land of the kingdom of Mali and included land to the east and north. Islam was the most widely spread religion in Songhai. Islam was the common source that unified the people of Songhai.

explanation: we can only guess at how our actions may be perceived in the future. doing something really big like killing lots of people, saving lots of people, affecting the lives of lots of people is a sure fire way of being remembered in historical records. we can also make a difference in the history records by being a small influence on something bigger, whether that is as a civil servant, scientist or artist.

of course you could argue that we all affect history just as tiny cogs in a   bigger machine.

if you mean how do people influence our opinions of things which have already happened, then simply by writing a book which looks at things form a different perspective and trying to convince people that this perspective is more accurate or truthful. people do it all the time i.e. richard the third was a terrible or was he? plenty would disagree, it's just that their views aren't the most widely known.n:

bujías y una hora antes y no me parece muy difícil