They weren't. They were the slave of choice used by the United States - but they were not the only creed enslaved by the west.
There were also Arabic slaves, Indian slaves, Chinese slaves, aborigine slaves and so on.
In history, some civilisations took slaves from nations they conquered for example, the Romans enslaved people - some which were forced to fight each other to the death for their entertainment.
In the American Civil War, yes. Labourers on the Southern plantations were imported from West Africa.
If you're asking about the many forms of slavery still flourishing today, such as people-smuggling and drug-debt exploitation, both the slaves and the slave-owner-drivers are from all races.
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No, and most abolitionists were white, because most blacks were slaves. Some blacks might have contributed by doing stuff as an abolitionist, but an abolitionist did not have to be a slave. (More appropreatly slaves couldent, only freed slaves could do anything)
Blacks Black BLacks
Because the whites thought they were "superior" to the blacks. So when the slaves didn't want to work, they were abused.
In Africa, some blacks did, and do in the present day, own slaves. In the United States of America I doubt if any black people held other black people as slaves.
the blacks were treated poorly while the whites were treated with respect. the blacks were like the whites slaves.