Step-by-step explanation:
The European nations were able to conquer large sections of Africa in those times because they had more advanced military technology. Europeans easily adapted to African climate and topography. But Also, Europe, has more advances in technology in warfare, transportations. Also their governments are strong and stable due to ones careful rule.
But the real reason for European dominant is because they really and I mean really focus on their militaristic aspect as which they relied on for stability, conquest, and glory because thousands of years, Kings and some Queens are tought the ways of war and how war can give more than just territory and as a matter of fact Kings had trained themselves in Europe for milania, so not just did Kings evolve but the technology to fight among themselves were drastically improved as well.
This is all the information I have sadly.