The largest factor for the growth of Cuba's commerce in the late eighteenth and early nineteenth century was the Haitian Revolution. When the enslaved peoples of what had been the Caribbean's richest colony freed themselves through violent revolt, Cuban planters perceived the region's changing circumstances with both a sense of fear and opportunity. They were afraid because of the prospect that slaves might revolt in Cuba as well, and numerous prohibitions during the 1790s on the sale of slaves in Cuba that had previously been slaves in French colonies underscored this anxiety. The planters saw opportunity, however, because they thought that they could exploit the situation by transforming Cuba into the slave society and sugar-producing "pearl of the Antilles" that Haiti had been before the revolution. As the historian Ada Ferrer has written, "At a basic level, liberation in Saint-Domingue helped entrench its denial in Cuba. As slavery and colonialism collapsed in the French colony, the Spanish island underwent transformations that were almost the mirror image of Haiti's." Estimates suggest that between 1790 and 1820 some 325,000 Africans were imported to Cuba as slaves, which was four times the amount that had arrived between 1760 and 1790.