[T]he legislation and histories of the times,
and the language used in the Declaration of
Independence, show, that neither the class of
persons who had been imported as slaves,
nor their descendants, whether they had
become free or not, were then acknowledged
as a part of the people ... used in that
memorable instrument.
from the Dred Scott decision, 1857
In this quotation, who are "they"?
Republicans
slaveholders
African Americans