This intrusion on African populous was made possible by the Atlantic Slave Trade, which took place over several centuries. The trade routes in West and Central Africa were heavily guarded at the coast and Sahara margins, by the people who lived in those regions. They extracted tolls from foreigners and often wouldn't let them explore the region or deliver their goods in person. Chattel slavery changed all of that. We will not cover that topic here however.
Military force serves only as a short-term solution.
Once the first is achieve one must come up with economic solutions quickly if they wish to maintain control over a people. Our study will show how economic control of Africa served to defeat self-reliance of a people who once had been independent and productive. Control of African economy achieved dimensions slavery never met. Europeans introduced spun glass beads as trade items. They were easy to transport over rugged terrain and Africans were already familiar with beads in the form of trade.