What was the original focus of the European expeditions that helped open the African interior other than trade and nationalism?

Question

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The original focus of the European expeditions that helped open the African interior was to explore the routes of major rivers such as the Niger and Congo in order to expand trade and commerce. The Europeans were also interested in finding new resources and potentially profitable territories to colonize. However, the primary objective was not to capture slaves for rubber plantations, search for deposits of gold, salt, or silver, or even to Christianize the natives (although some missionaries were involved in exploration).

What Was the Original Focus of the European Expeditions That