““Expansion is a necessity of slave societies; the slave power requires ever fresh conquests.17 “It is more profitable,” wrote Merivale, “to cultivate a fresh soil by the dear labour of slaves, than an exhausted one by the cheap labour of free-men.”18 From Virginia and Maryland to Carolina, Georgia, Texas and the Middle West; from Barbados to Jamaica to Saint Domingue and then to Cuba; the logic was inexorable and the same.””