Final answer:
Gold and salt were the valuable trade items that contributed to the wealth and significance of Ghana, Mali, and Songhai.
Explanation:
Gold and Salt were the two unusual trade items that made Ghana, Mali, and Songhai increase in wealth and importance. Gold was traded from the southern region of today's Ghana and was highly sought after in global trade networks. Salt, essential for food preservation, was mined in the Sahara desert and held significant value, often rivalling that of gold.
Learn more about trading commodities in West Africa here:
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