Well, ask yourself, it it was all black and powerful, why are there no widespread and pervasive vestiges of this these once super advanced people? It's a fair question.......
Yes it is fair, but due to the treachery of yt, you have to look for it. It' all around, you just have to books that tell the truth. May I suggest this one as a start?
Black Athena: The Afroasiatic Roots of Classical Civilization (The Fabrication of Ancient Greece 1785-1985, Volume 1)
You have to get away from what modern history has taught you.
Peace!