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Crop exchange: history of agriculture 2 topics: Coffee between Ethiopia and Yemen; The Columbian Exchange: crops, people and oceans.
Coffee between Ethiopia and Yemen : 15th–17th centuries · cultivation, drinking and trade, Ethiopia and Yemen · Red Sea trading routes. Arabica’s African origins, Yemen’s mountain farms and commerce through Red Sea ports together shaped the early coffee economy.The Columbian Exchange: crops, people and oceans : from 1492 CE, Americas, Europe and Africa · later global networks. Maize and potatoes spread beyond the Americas; wheat and livestock travel in the opposite direction.
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