In 1510, there were 10,000 Spaniards in the colony of Santo Domingo, and it rose to over 20,000 in 1520. But following the depleting of the gold mines, the island began to depopulate, as most poor Spanish colonists embarked to the newly conquered Mexico or to Venezuela (which was aggravated by the conquest of Peru in 1533). This was followed by a limited Spanish migration toward Hispaniola, composed overwhelmingly by males. In order to counteract the depopulation and impoverishment of the colony, the Spanish Monarchy allowed the importation of African slaves to hew sugar cane.