The first slaves in America were called Indentured servants.
The native Americans kept slaves even before Leif Eriksson found his way to North America.
So did the Vikings.
Compare the life of today's African-Americans to the life of the relatives they left behind in sub-Saharan Africa today. Even though they have benefited immensely, it would still be wrong to force African-Americans to pay reparations -- and who would they pay reparations to after all these years?