How does slavery in Africa prior to European arrival differ from accounts of slavery depicted in secondary history textbooks used in the United States

How does slavery in Africa prior to European arrival, differ from accounts of slavery depicted in secondary history textbooks used in the United States?

To be written in MLA format. Must compare slavery in Africa before the Europeans arrived in the United States, and after. Use evidence from the Slave Narratives via the source (www.loc.gov) Also, use evidence from the textbook in the attached photos.