Latest / The Atlantic Slave Trade: Empire Built on Human Suffering — Fexingo History / The 1713 Asiento: Britain's License to Traffic in Human Beings
Transcript
- Lucas: So we've covered a lot of ground in this series — the ships, the revolts, the empires that ran the trade. But there's one piece of the puzzle that I think ties together a lot of what we've talked about: the asiento. It's a Spanish word, basically meaning 'contract' — but specifically, a contract to supply enslaved Africans to Spain's American colonies. Luna: Right, I've heard that term before — the asiento de negros. It was like a monopoly license, wasn't it? Lucas: Exactly. And it's one of the most important — and brutal — commercial arrangements in Atlantic history. The Spanish crown didn't directly engage in the slave trade themselves, so from the early 1500s they auctioned off the right to bring enslaved people into their colonies. The holder of the asiento got a legal monopoly to supply a fixed number of slaves — usually several thousand a year — to ports like Veracruz, Cartagena, and Buenos Aires. Luna: So whoever held the asiento controlled the legal slave trade to the entire Spanish Empire. Lucas: Precisely. And over two centuries, it passed through many hands — Portuguese merchants held it for much of the 16th and early 17th centuries, then the Genoese, then the Dutch. But the most famous — and infamous — period began in 1701, with the outbreak of the War of the Spanish Succession. Luna: The war over who would inherit the Spanish throne after the last Habsburg king died without an heir. Lucas: Right. On one side, the Bourbon claimant Philip of Anjou — grandson of Louis XIV of France — backed by France. On the other, the Habsburg candidate Archduke Charles of Austria, backed by Britain, the Dutch Republic, and others. The war dragged on for over a decade, but when it ended with the Treaty of Utrecht in 1713, the big winner was Britain. And one of the key prizes they extracted from Spain was the asiento. Luna: So Britain got a thirty-year monopoly to supply slaves to Spanish America. Lucas: Yes — the asiento was granted to the South Sea Company, a British joint-stock company that had been founded just two years earlier, in 1711. The company's official name was 'The Governor and Company of the merchants of Great Britain, trading to the South Seas and other parts of America, and for the encouragement of fishing.' But everyone just called it the South Sea Company. And its primary business was the slave trade. Luna: Wait — the South Sea Company? I know that name from the South Sea Bubble, the huge financial crash in 1720. Lucas: Exactly the same company. And the asiento was central to that whole story. The company's directors — who included some of the most powerful men in Britain, like the Chancellor of the Exchequer Robert Harley — sold shares to the public with promises of immense profits from the slave trade. They claimed they would supply 144,000 slaves over thirty years. That's 4,800 a year. Luna: And the public bought into it, driving up the stock price. Lucas: Hugely. The stock price rose from around £100 in early 1720 to over £1,000 by mid-summer. But the company wasn't actually delivering anywhere near that number of slaves — they were struggling to organize the trade, and the costs were much higher than expected. When the bubble burst in September 1720, thousands of investors were ruined. But the asiento itself continued, even after the crash. Luna: So the actual slave trading part of the business kept going despite the financial collapse? Lucas: Yes. The South Sea Company continued to send ships to Africa and then to Spanish America for the rest of the asiento period, which ran until 1739 — when war between Britain and Spain ended it early. In total, the company delivered somewhere around 34,000 enslaved Africans under the asiento, according to modern estimates. That's far fewer than the 144,000 promised, but still a massive number of human lives. Luna: And what about the Spanish side? How did the asiento affect conditions in the colonies? Lucas: The asiento created a legal framework for the slave trade, but it also fueled massive smuggling. British ships under the asiento would often bring more slaves than their contract allowed, and they'd sell the extras illegally. They also used the asiento as cover to bring in British goods, which undercut Spanish merchants. So the Spanish crown got a cut of the official slave sales, but they lost control of their own colonial markets. Luna: So the asiento was a constant source of tension between Britain and Spain. Lucas: Absolutely. Spanish officials complained constantly about British cheating. And the British crown, in turn, used the asiento as a diplomatic tool — it was one of the main sticking points in negotiations for decades. The asiento was even a major cause of the War of Jenkins' Ear in 1739, which was triggered by a Spanish coast guard captain cutting off the ear of a British smuggler named Robert Jenkins. But behind that absurd pretext was the real issue: British resentment over Spanish enforcement of trade restrictions, and the asiento was at the heart of it. Luna: And once the war ended the asiento, what happened next? Lucas: After the war, the asiento was not renewed. The Spanish crown instead allowed open trade in slaves to the colonies, meaning any Spanish or foreign merchant could supply slaves under license. But the legacy of the asiento was profound. It had established a massive, state-sanctioned slave trade that fed the Spanish American economies for decades. And it also showed how deeply intertwined the slave trade was with high finance and imperial politics. Luna: It's a reminder that the slave trade wasn't just about ships and plantations — it was also about stock markets and treaties and the highest levels of government. Lucas: Exactly. And that's what makes the asiento such a crucial piece of the puzzle. It connects the dots between the African coast, the Caribbean plantations, the counting houses of London and Amsterdam, and the royal courts of Europe. Luna: And it's a story that doesn't get as much attention as some of the others we've covered. Lucas: That's true. But I think it's one of the most revealing episodes in the entire history of the Atlantic slave trade. It shows how the trade wasn't just a brutal enterprise — it was a sophisticated, global business that involved kings, financiers, and ordinary investors. Luna: Speaking of which — a quick honest thing. A handful of listeners chip in monthly through buy me a coffee dot com slash fexingo, and that's literally what funds making this many of these. If you've been coming along with us through this series — from the Zong to the Clotilda to the Haitian Revolution — and you want to see more, that's the way to make it happen. Lucas: And it keeps the show ad-free, which means we can dive into these detailed stories without interruption. So if you're able, that's buy me a coffee dot com slash fexingo. No pressure, just a thank you to those who already do. Luna: Alright — back to the asiento. I want to know more about how the actual trade worked on the ground. How did a ship deliver its human cargo under the asiento? Lucas: Great question. The South Sea Company established 'factories' — trading posts — on the African coast, mainly at fortified sites like Cape Coast Castle and Fort James in Gambia. They would purchase enslaved people from African traders, usually in exchange for textiles, guns, and other goods. Then they'd load them onto ships and transport them across the Atlantic. Luna: So the company was directly involved in the African side of the trade, not just the shipping. Lucas: Yes. They had their own agents, their own ships, and their own forts. And they had to coordinate with Spanish colonial officials at the delivery ports. The asiento specified that slaves had to be landed at designated ports — Veracruz for New Spain, Cartagena for New Granada, and Buenos Aires for the Rio de la Plata region. There, Spanish officials would inspect the cargo, collect the royal tax of 33⅓ pesos per slave, and then the company could sell the rest. Luna: And the company kept the profits from those sales. Lucas: Right. But they also had to pay a hefty annual fee to the Spanish crown — about 200,000 pesos — just to keep the monopoly. So the economics were tricky. The company had to sell slaves at a high enough price to cover the fee, the shipping costs, and the purchase price in Africa, and still turn a profit. That's one reason they resorted to smuggling — to make up the margins. Luna: I read that the asiento also included a provision for the company to send a certain number of 'licensed' slaves to the colonies — but that the Spanish authorities often complained about the quality and health of the enslaved people being delivered. Lucas: Yes, that was a constant issue. The asiento contract specified that slaves had to be healthy and 'of good quality,' but the company, like all slave traders, prioritized profit. Many enslaved people arrived sick or injured from the Middle Passage. Spanish officials sometimes rejected entire shipments, leading to disputes that dragged on for years. Luna: So the asiento was a source of conflict even between the allies who signed the treaty. Lucas: Exactly. And that conflict eventually helped bring the whole system down. By the 1730s, British smuggling under cover of the asiento had become so flagrant that the Spanish crown stepped up enforcement. The British public, fed stories of Spanish cruelty — like the Jenkins' ear incident — clamored for war. And when war came in 1739, the asiento was one of the first casualties. Luna: And after the war, did the slave trade to Spanish America continue much as before, just without the monopoly? Lucas: Yes, but under a different system. The Spanish crown opened the trade to any licensed merchants, including Spanish, French, Dutch, and eventually even British traders again after 1750. The volume of enslaved people imported into Spanish America actually increased in the later 18th century, as plantation economies — especially sugar in Cuba and coffee in Venezuela — expanded. So the end of the asiento didn't mean the end of the slave trade — it just changed the business model. Luna: So in a way, the asiento was a kind of peak of state-sponsored slavery — a legal monopoly granted by one empire to another, with the explicit goal of supplying human beings as labor. Lucas: That's exactly what it was. And it's a stark reminder that the slave trade wasn't some peripheral, shameful secret of the early modern period. It was a central, openly negotiated part of international diplomacy and commerce. The Treaty of Utrecht is celebrated as a milestone in European peace, but it also included the largest state-sanctioned slave-trading contract in history. Luna: It's a sobering way to think about that treaty. Lucas: It really is. And it's a chapter that doesn't get nearly enough attention in the standard narratives of European imperialism. So I'm glad we could spend some time on it today.