What is the importance of salt and gold in west Africa

The commodities gold and salt were important to many regions of West Africa because they helped create great wealth and vast trade networks that spread new ideas.

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these civilizations were located around fertile rivers, where they could produce an abundance of crops

the correct answer is:   the domino theory states that if one country in a region came under the influence of communism, then the surrounding countries would follow in a domino effect.