Respuesta :

Answer:

Ghana, Mali, and Songhai were located near Niger river, in the west of Africa and south of the Sahara Desert.

Explanation:

Trade was extremely important for Ghana, Mali and Songhai because this was the only way for development for these countries. These three empires of pre-colonial period in West Africa earned a lot of profits from the trans-Saharan gold trade. There was demand for gold increasing across the world. People who spoke Berber found trade routes across the Sahara Desert to West Africa.

Gold created a lot of wealth for these countries and they could expand their territories and then gain salt and other needed goods from other countries.

The detail on the map that shows that Ghana, Mali and Songhai were built on trade is the passage of trade routes through those empires.

What details on the map indicate trade?

The Mali, Songha, and Ghana empires were built on trade routes between North Africa and West Africa.

This allowed them to take advantage of the lucrative trade in various resources such as salt and gold, to become quite prosperous.

Find out more on the Ghana empire at https://brainly.com/question/341877.