Jamestown and Plymouth serve as iconic images of British migration to the New World. A century later, however, when British migration was at its peak, the vast majority of men, women, and children crisscrossing the Atlantic on English ships were of African, not English, descent. Captives and Voyagers, a compelling study from Alexander X. Byrd, traces the departures, voyages, and landings of enslaved and free blacks who left their homelands in the...