What if the Black Plague had killed off almost all Europeans? Then the Reconquista never happens. Spain and Portugal don't kickstart Europe's colonization of other continents. And this is what Africa might have looked like.
I have been a history teacher for 18 years, this video is an amazingly accurate assessment of the Atlantic Slave Trade. Excellent New TED-ED Video: “The Atlantic slave trade: What too few textbooks told you”
This is a picture of a political map of europe in It depicts the lines defining the states. It also shows what states were in the Triple Entente(blue), Triple Alliance(purple), and Russian allies(green).