How was the practice in Africa and other partas of the world similar to and different from slavery in America ?

I can't give you a direct answer but I can tell some facts about the two.

Explanation:

A lot of people believe that the Americans hunted down the africans and took them from there homes or villages. But in fact that is false there were many colonies in africa that sold their people to others for money and other things. I don't think they were treated any better anywhere in the world because they were considerd slaves; many people thought that weren't really people but property and people can do whatever they please with their own property. That is all I have for at least now let me know if that helped at all. Have a great day.

c, they united with once

the answer would be c