A result of colonial economic policy on African nations was that they

The colonial economy was dedicated to the production of raw materials and minerals for export, crops such as cotton and cereals in the time of the industrial revolution. The Portuguese started trading in West Africa for the same products as gold, ivory, and slaves. Under colonial rule, the agricultural plantation system was introduced to grow large quantities of cash crops and employ cheap African labor to export to European countries.

A result of European economic policies were that many African riches were exploited beyond all measure and the goods were taken back to Europe for manufacture or to the Americas for trade. They also enabled for locals who worked with Europeans to become rich which then caused them to become ruthless to others who were poor due to belonging to other tribes who didn't cooperate.