I couldn't even finish reading this tripe.   Gerry is cementing his communist credentials with the usual anti-white western pap.
He, of course, fails to mention that Europeans did not invent slavery and did not bring slavery to Africa.   While there is evidence that there was a difference in the type of slavery within Africa (indentured based on debt) no such difference existed when the Moslems in North Africa bought and sold Africans for profit. 
He also failed to mention that African tribes captured people from other African tribes to be sold to the European slave traders.