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How did the asiento agreement expand British trade with Spanish colonies?

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Illustration of the Battle of Blenheim showing cavalry and infantry in combat, fallen soldiers, and smoke rising from cannon fire across a hilly battlefield. — War of the Spanish Succession The Battle of Blenheim (August 13, 1704), was the most famous victory of John Churchill, duke of Marlborough, and Eugene of Savoy during the War of the Spanish Succession.

Following the War of the Spanish Succession, the 1713 Treaty of Utrecht granted the British South Sea Company the asiento de negros, a monopoly to supply enslaved people to Spanish colonies in the Americas for 30 years.12

This agreement expanded British trade in two primary ways:

Slave Trade Monopoly: The company was authorized to transport 4,800 enslaved individuals annually to Spanish-American markets.1
General Trade Access: The contract included the right to send one ship, known as a navío de permiso, each year to engage in general commercial trade with the Spanish colonies.1

While the enterprise often proved unprofitable due to war, taxation, and logistical challenges, the asiento provided Britain with a strategic foothold to participate in the lucrative Spanish-American market and access precious gold and silver bullion. Furthermore, the legal trade often served as a cover for illicit commercial activities, which eventually contributed to rising tensions and the War of Jenkins’ Ear.1