The kingdom was rich in gold and other minerals such as iron, following the decline of Meroe.In addition, the kingdom naval power necessitated it to offer ferry services for goods to and from Rome and India. the kingdom more also had a very good harbor at Idris.
B .international trade along the east africa coast led to intermarriages,introduction of new products,money economy,architecture and rise of new people such as the Swahili
Answer: A. Phillip Randolph
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The advantages of hydraulic mining compared to placing mining it enabled that miners are to easily access deeply buried gold etc