As Italian capitalism matured, however, this emphasis on trade was to change for three reasons. Briefly, they were the expansion of the power of the Ottoman Turks in the eastern Mediterranean in the fifteenth century, the extension of sugar-cane cultivation from Asia Minor to Cyprus, Sicily, and the Atlantic islands (Madeira, Cape Verde, and the Azores) at the end of that century, and the collaboration of Genoese capitalists with the ruling classes of Iberia. These events transformed the incidental relationship between capitalism and slave labor into the very foundation of New World enterprise.

Cedric J. Robinson, Black Marxism_ The Making o…, loc. 585