Niger River trade was controlled by various European powers like British, French, German and the Belgians.
Explanation:
The Niger river is a long river that is in a sense the lifeline of all of West African trade even today as it drains the large fertile lands of the area.
In the colonial time it was through this river that the trading was happening in the colonies to the parental states in Europe.
This was carved out for Belgium who controlled the Congolese area and the French who controlled the coastal nations while the British controlled the area around Nigeria and the Germans also laid a claim to the lands there.
