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

The answer is:

Ghana Empire

Mali Empire

Songhai Empire

All of these empires were known by the European empires specifically for the quality of their gold and salt. At that time, The representatives from British empire and the French empire frequently visited these empires because it is far cheaper to obtain gold metal on these African empire compared to actually mining them in European land.

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