This work explores a neglected aspect of the forced migration of African laborers to the Americas. Hundreds of thousands of captive Africans continued their journeys after the Middle Passage across the Atlantic. Colonial merchants purchased and then transshipped many of these captives to other colonies for resale. Not only did this trade increase death rates and the social and cultural isolation of Africans; it also fed the expansion of British slavery and trafficking of captives to foreign empires, contributing to Britain's preeminence in the transatlantic slave trade by the mid-eighteenth...