This. Just to expand on a little further; every race has enslaved every race (yes, this includes their own race as well).

The first official slave holder (where the slave being indentured for life was not held as the verdict of a sentence for a crime) in North America was a black man (Anthony Johnson) that brought a case to the court of the colony of Virginia and they determined after one ruling and an appeal to that ruling won his case to own a black man (John Casor) as a slave (as opposed to releasing him from indentured servitude after his contract was noted as fulfilled).

Irish being coerced or forced into indentured servitude (not technically slavery, you were still supposed to have rights as an indentured servant) was very prominent from the 17th century onward as well. Often times the treatment of the Irish was far worse than that of Black slaves.