 The people captured on these expeditions were shipped by European traders to the colonies of the New World.As a result of the War of the Spanish Succession, the United Kingdom obtained the monopoly ("asiento de negros") of transporting captive Africans to Spanish America.It is estimated that over the centuries, twelve to twenty million people were shipped as slaves from Africa by European traders, of whom some 15 percent died during the terrible voyage, many during the arduous journey through the Middle Passage.