Though not well known outside of the semiarid tropics, these two African crops were and are primary sources of protein for agriculturists:

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Quizplus · Accepted Answer

Millet and sorghum are both important drought-resistant crops that have been cultivated for thousands of years in Africa. They are rich in protein, as well as other important nutrients. Despite their importance, they are often undervalued and underutilized outside of the regions where they are traditionally grown.

Though Not Well Known Outside of the Semiarid Tropics, These