African civilizations, as great as they were, share one thing in common with all civilizations --- they rise and they fall.
As "great" as America is -- it will crash and burn too. The prospects of America lasting thousands of years as Arican Civilizations have is truly a testimony to how great they were,
Scholars, throughout history, have known western civilization came from the Greek, and the Greeks learned everything they know from Africans.
Greek Civilization is in ruins, and they no longer have influence, the same is true with Italy, Spain, Portugal -- all is western Europe, including the Bristish Empire, is a shell of itself. No one wrings their hands over the fall of these civilizations.
The fall of African Civilizations has been explained in many books including:
Africa: The Mother of Western Civilization
by “Dr. Ben” Yosef Ben-Jochannan
How Europe Underdeveloped Africa
by Walter Rodney
The Destruction of Black Civilization: Great Issues of a Race from 4500 B.C. to 2000 A.D.
by Chancellor Williams
Civilization or Barbarism: An Authentic Anthropology
by Cheikh Anta Diop
The African Origin of Civilization: Myth or Reality
by Cheikh Anta Diop
Notes for an African World Revolution: Africans at the Crossroads
by John Henrik Clarke
Stolen Legacy: Greek Philosophy is Stolen Egyptian Philosophy
by George G. M. James
The Real Facts About Ethiopia
by J. A. Rogers
African People in World History
by John Henrik Clarke
When We Ruled: The Ancient and Medieval History of Black Civilizations
by Robin Walker
Enjoy!