The "colonial powers" were last into slavery, and FIRST out. In Africa, slaves were taken by Black people. Slavery existed in Africa  long before the White slave traders turned up. If anything it is the  FACT that slavery existed before, that gave the White slave traders the  idea in the first place. Not really much evidence around that time in  White "western" societies of slavery, before visiting Africa.
If anything it the the White Slavs of Eastern Europe that should object to the term "slave".
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		| The term slave has its origins in the word slav. The slavs, who  inhabited a large part of Eastern Europe, were taken as slaves by the  Muslims of Spain during the 9th century AD. | 
	
 
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		| In Africa there were a number of societies and kingdoms which kept  slaves, before there was any regular commercial contact with Europeans,  including the Asanti, the Kings of Bonny and Dahomey. |