Overview: The First Global Economy & Its Human Cost
John Green traces the rise and fall of the Aztec and Inca civilizations, the Spanish conquest, and how silver from the Americas reshaped the entire planet, often for the worse.
Aztec Empire: Power Through Tribute & Terror
- Formed ~1430 from a triple alliance of city-states in modern Mexico.
- Hierarchical society: emperor, nobles, powerful priests.
- Human sacrifice central to religion, appeasing gods to prevent cosmic disasters (cyclical history ending in apocalypse).
- Demanded tribute (goods, precious metals, sacrificial victims) from conquered peoples.
- Capital Tenochtitlan (modern Mexico City) was a canal-based city like Venice, with floating gardens (chinampas).
- Ruled over many resentful subjects, making it easier for Cortés to find allies.
Open Letter: Human Sacrifice
Green draws parallels to modern "sacrifice" narratives (e.g., Armageddon), arguing that belief in existential threats makes sacrifice "logical", a pattern we still repeat.
Inca Empire: Centralized Labor Without Writing
- Older than Aztecs; ruled 4–6 million by 1532.
- No written language, used knotted quipus for records.
- Mit’a system: mandatory unpaid labor for the state (roads, temples).
- Integrated conquered peoples by mandating Incan language and labor contributions.
- Spanish later adopted and worsened the mit’a for silver mining.
Spanish Conquest & Colonial Administration
- 1519 (Mexico) and 1532 (Peru): disease had already devastated populations.
- Created two viceroyalties: New Spain (1521) and Peru (1542).
- Adapted existing Aztec/Inca hierarchical structures for colonial rule.
The Silver Mountain & Forced Labor
- Cerro Rico (Potosi, Bolivia) produced >150,000 tons of silver, >80% of global supply.
- Spanish required 1/7 of adult male Indians to work mines for subsistence wages.
- Mercury poisoning from refining (Huancavelica mine) so rampant parents maimed children to spare them.
- Why not African slaves? Cheaper to use indigenous labor; slaves lacked high-altitude experience and faced deadly conditions.
Economic & Political Consequences
Spain: Inflation & Overreach
- Silver flood caused skyrocketing inflation; royal tax rates stayed static, devaluing revenue.
- Wealth funded expensive wars (Netherlands rebellion, Spanish Armada 1588).
- Repeated debt defaults in the 17th century.
China: Silver Hunger & Silk Glut
- 1/3 of American silver went to China (directly or via trade).
- Ming dynasty switched to silver taxes (from grain/labor), forcing everyone to produce goods for silver, mostly silk.
- Silk oversupply crashed prices, hurting Spanish silk producers.
- Ming also failed to adjust for inflation; overspent on defense (Great Wall) → overthrown by Manchus (Qing dynasty).
Global Ripple Effects
- First truly global market: silver connected Americas, Europe, China, and India.
- Silver pesos became de facto world currency.
- Dutch and English rebellions partly funded by American silver.
- Ironic result: English victory over Armada boosted Elizabeth I’s prestige, funding arts → Shakespeare’s plays (e.g., about King Richard).
Lasting Trade-Offs
- Environmental destruction, millions of deaths (mining, mercury, conquest).
- Destruction of two great empires (Aztec, Inca).
- Yet this global system created the interconnected world we live in today, including the technology to produce this video.
Key quote (historian Dennis Flynn): "A significant hunk of the GDP of China... was surrendered in order to secure a white metal... Think about what else those resources could have been used for."
Final Reflection
"Worth the sacrifices? I don’t know. You tell me." – John Green
Hi. I’m John Green, this is Crash Course World History and today we’re going to talk about the entire fracking globe over the course of several centuries so let’s get right to it! Mr. Green! Fracking?
You don’t know about Battlestar Galactica yet, Me From The Past? Oh, man, there are so many great things in your future! Today, I’m going to try to show you how tiny Spain’s influence spread around the
world and shaped the lives of almost every human on the planet, generally in negative ways. I know, everything is such a bummer on Crash Course recently. It’s the sixteenth century. People are getting richer, they’re living more connected lives and all I can do is whine
about how much better the old days were. What am I, your grandpa? Let’s get festive. Woooo! [theme music]
So the Aztecs weren’t the first impressive polity in Mesoamerica, that honor would go to the Olmecs or the Mayans. But they were probably the greatest. The Aztecs formed out of an alliance of three major cities in modern day Mexico in about
1430, just 89 years before Cortez and his conquistadors showed up. The Aztec state was very hierarchical, with an emperor at the top and a group of unruly nobles beneath him, just like Europe! And in addition, there was a class of powerful
priests whose job it was to keep order in the cosmos. So, Aztec religion held that history was cyclical and punctuated by terrible disasters and then would ultimately end with a massive apocalypse. And the job of the priests was to avoid these
disasters, by appeasing the gods, generally through human sacrifice. The Aztecs extended their control over most of southern Mexico, parts of Guatemala and the Yucatan, and they demanded tribute from conquered people in the form of goods, precious
metals, and people to sacrifice. If you’re familiar with The Hunger Games, it won’t surprise you to learn that this didn’t sit very well with said conquered people. And the fact that the Aztecs were
basically ruling over thousands of people who hated them made it a lot easier for Cortez to come in and find allies to overthrow them. All that noted, in less than a hundred years, the Aztecs accomplished some amazing things.
Especially the building of their capital city Tenochtitlan, on the site of modern day Mexico City, which was like Venice in that it was divided and serviced by canals. They also had floating gardens, called chinampas, which provided food for the city. Oh, it’s already
time for the open letter? Alright. An open letter to Human Sacrifice. But first, let’s see what’s in the secret compartment today. Oh, nice! Come on. Be a mushroom, be a mushroom, be a- ohhh dahh!
Dear Human Sacrifice, Look, I’m not going to defend you. But if you really believe that the world is going to end if the gods are not appeased, then human sacrifice... kind of makes sense. And as evidence for this, let me submit to you that we engage in human sacrifice all
the time. Remember the movie, The Dirty Dozen? No? Because you’re too young? That makes me hate myself. Anyway, it was all about glorious sacrifice and how a few have to die in order for many to live. Did you at least see that uh, that meteor movie that Ben Affleck was in? What was that called, Stan?
Stan: Asteroid. John: Asteroid! Stan: Armageddon.
John: Armageddon! Armageddon. Right. Like that. Human sacrifice. Best wishes, John Green Alright, now let’s head south to the Inca civilization, which was older than the Aztecs
and in some ways even more impressive. Founded in the 13th century, the Inca empire ruled between 4 and 6 million people by the time the Spanish showed up in 1532. Trade and a very effective administrative structure held the empire together, which
was even more impressive when you consider all the roads and temples that were built atop mountains with nothing to haul things up those mountains, except for llamas and people. The Inca had no written language but they were able to keep records with knotted strings
called quipus. And they were really good at integrating conquered people into the empire, mandating that people learn the Incan language and vitally, they ordered every male peasant under the Inca control to do unpaid work for the Inca government for a specified period of time each year.
This system, which the Inca called mit’a allowed them to build all those roads and temples. The Spanish would later adopt this system, and the hierarchical system with the emperor at the top, except they would make it all, you know, much suckier. And, yes,
that is a technical historian term. So, the Spanish arrived in Mexico in 1519, and in Peru in 1532, benefiting in both cases from total chaos due to disease. And after conquering the Inca and the Aztecs, they created
an empire with two administrative divisions. The Vice royalty of New Spain, founded in 1521, and the Vice royality of Peru, founded in 1542. In some ways, the Aztec and Inca empires were perfect for Spanish conquest. Their administrative
structures were similar, there was a similar link between secular and religious power, albeit different religions. All of which made it relatively easy for the Spanish crown to step into the void left by those two great empires and send their own administrators to run the place.
While most of the Spanish aristocrats who came over ran large agricultural operations, you don’t see a lot of movies called, like, Indiana Jones and the Search for A Nice Farm in the Countryside. The real glory for conquistadors was gold.
Initially they found some, both in the Caribbean and in Mexico, but never enough to get, like, super-rich. Fortunately, or as I will argue, unfortunately, they did find a mountain made of silver. So the Spanish adapted the mit'a, which the Incas had used to build roads and public buildings,
to mine and process that silver. So one seventh of the adult male Indian population from each district was required to work in the silver mines for a year, being paid only subsistence wages. Now, you might wonder why the Spanish didn’t purchase African slaves to work in the mines.
They did in Mexico, but in South America it was cheaper to use indigenous labor. Purchasing slaves was inefficient because one: They didn’t have experience working at high altitudes, and two: Mine work was super deadly.
Mercury, which can be used to refine silver ore, was found at the mountain of Huancavelica. And mercury poisoning among miners was so common that parents would often maim their children to keep them from having to work the mines. You can see why I’m struggling
to be festive! Let's go to the Thought Bubble. So Spanish mines in the Americas produced over 150,000 tons of silver between the 16th and the 18th centuries, over 80% of the world’s supply. Spain became the richest nation in
Europe and Spanish silver pesos became the de-facto currency. But the Spanish royal family does not appear to have understood inflation, and the huge influx of silver caused skyrocketing inflation, and since they never set tax rates to account
for it, they collected the same amount of money sixty years after the discovery of silver, but that money was worth a fraction of what it once had been. And in general, it’s not clear that Spain benefited much from the discovery of silver.
Rich countries have a way of finding their way into expensive and not totally necessary wars, and Spain was no exception. While empire wasn’t the central cause of Spain’s many 16th century wars, it sure did fund them.
So in 1519, which was a heck of a year for Spain, Charles V united the kingdoms of Spain and Austria by being named head of the Holy Roman Empire, so called because it was not holy, not Roman, and not an empire.
Charles had this dream of a unified central Europe, which was constantly being thwarted by German nobles, who had a dream of a non-unified central Europe, and eventually Charles V’s ambitions were shattered and he gave the Austrian half of his kingdom to his son Ferdinand,
and gave Spain with the American stuff to Philip in 1556. Thanks, Thought Bubble. So, Philip II didn’t only inherited all of Spain’s holdings in the Americas and in Europe and in the Phillip-not-a-coincidence-ines. He also inherited a rebellion in the Netherlands,
because the Dutch were like, “We’re gonna be Protestant, also you guys know nothing about economics,” which, incidentally, the Dutch are still saying to the Spanish. And then the English sided with the Dutch and there was a war featuring a disastrous
invasion of England, called the Spanish Armada, in 1588. England’s success against the Spanish, even though it can largely be chalked up to the weather, was credited to Queen Elizabeth I. That led to a period of wealth and national pride, which meant that people had both the
money and the desire to see, I don’t know, plays about old English Kings named Richard. And that, my friends, is how the discovery of silver in Bolivia contributed to the genius of William Shakespeare. Anyway, American silver didn’t cause these wars anymore than it wrote Hamlet, but the
new wealth made both more possible. Knowing that they had this enormous silver “war chest” at their disposal made them much more inclined to build all those ships that got sunk in 1588. And soon enough even a mountain of silver couldn't pay for all their warring, and the
Spanish crown had to borrow money, which they couldn’t pay back, so they defaulted on their debt several times in the 17th century. Yay, silver! So, most of the silver mined in the Americas went to Europe, but at least a third of it
went to China. Either directly, on Spanish galleons, or indirectly through through the purchase of Chinese goods. China had encountered inflation of its own after printing the world’s first paper money
in the 12th century, so they switched back to coins. Initially, Chinese coins were made out of copper or bronze, but their economy was so big — they were the leading producer of consumer goods until the 19th century — that they ran out. So they went to silver.
Now, China didn’t have a lot of silver itself, but Japan did, so they traded manufactured goods for it, but soon even that wasn’t enough. This was mostly because in the 16th century, China changed its tax structure. Taxes, man, they’re at the center of human history.
In the early part of the Ming Dynasty, Chinese farmers paid their taxes in goods, mainly grain, and labor. But as more silver entered the economy, the Ming government changed its policy and required taxes to be paid in silver.
This meant that almost everyone in China had to produce something that could be sold for silver, which usually meant silk. In fact, the Ming government often required people to make silk. That glut of silk inevitably led to a price drop, which hurt the Chinese economy but not
nearly as much as it hurt the Spanish economy, where almost every silk producer was put out of business. So much for the idea that global outsourcing is a new problem. You’d think all this silver would make the Chinese incredibly rich, just like the Spanish,
right? Well, yes, just like the Spanish, in that they got rich, but they didn’t stay rich. The Ming government also failed to peg taxes to inflation, and spent too much on defense, notably the Great Wall.
And by the 17th century the Ming were overthrown by the Fu Manchus. Oh, it’s just the Manchus? Guh! History, always disappointing me. As the historian Dennis Flynn put it, “A significant hunk of the GDP of China – then the world’s biggest economy – was surrendered in order
to secure a white metal that was produced mostly in Spanish America and Japan... Think about what else those resources could have been used for.” The Spanish empire’s silver trade was the first truly global market — even India was involved,
but we’re really out of time — and its consequences were dire, even if it did make some people rich. Both Spain and China experienced inflation that weakened their governments. The environment suffered. The search for precious metals led the Spanish to find and eventually destroy
two of the world’s great empires, the Aztecs and the Inca. And many thousands were killed mining silver and the mercury used to refine it. But before you say it wasn’t worth it, remember that this process led to the life that you have
today, one where I can teach you history through the magic of the Internet. Worth the sacrifices, human and otherwise? I don’t know. You tell me. Thanks for watching. See you next week. Crash Course is produced and directed by Stan Muller. Our script supervisor is Danica Johnson.
The show is written by my high school history teacher Raoul Meyer and myself, and our graphics team is Thought Bubble. Last week’s phrase of the week was “number four, letter u” if you want to suggest future
phrases of the week or guess at this week’s you can do so in comments, where you can also ask questions that will be answered by our team of historians. Thanks for watching Crash Course, and as we say in my hometown, Don't forget to be awesome!
The Aztec and Inca empires, along with the Spanish colonial system, created the first global economy primarily through the extraction and trade of silver. The massive silver mining at Potosí (Bolivia) and other sites, fueled by forced indigenous labor, created a global currency that connected the Americas, Europe, and Asia, especially China, which demanded silver for its economy.
The Spanish exploited the existing Incan mit’a system, which was a form of mandatory labor for the state, but made it far more brutal and deadly. They required 1/7 of adult indigenous men to work in silver mines for subsistence wages, and many died from mercury poisoning in the refining process. This system was a key driver of the mass death of native populations.
The massive influx of silver caused severe inflation in Spain, devaluing its currency and making its goods uncompetitive. The Spanish crown spent this wealth on expensive wars, such as the failed Armada against England, leading to repeated debt defaults. This 'silver curse' ultimately weakened Spain's economy and global power.
The Ming dynasty needed silver to pay for defense against Mongols and Manchus, but it hit a crisis when the global supply of silver was disrupted. The resulting inflation and economic instability weakened the Ming, leading to widespread rebellion and their eventual overthrow by the Manchus, who established the Qing dynasty. This shows how dependent China had become on a global resource.
The Spanish conquest succeeded due to a combination of factors: the devastating impact of European diseases (smallpox, measles) which killed millions before the conquistadors arrived, the Spanish ability to exploit existing resentments among conquered peoples (e.g., Aztec subjects), and their superior military technology (horses, guns, steel). The Spanish also adapted existing indigenous hierarchical structures for colonial rule.
The Spanish primarily used forced indigenous labor (encomienda and mit’a systems) for mining and other work because it was cheaper than importing African slaves. Indigenous workers were already present in large numbers, knew the local environment and high-altitude conditions, and the Spanish could exploit existing labor systems. African slaves, while also used, were more expensive and less suited to the high-altitude mining conditions.
The video argues that the modern, interconnected world—including global trade, economic systems, and even the technology used to create the video—is built on the foundations of this brutal colonial system. It highlights the 'trade-offs' of history: massive human suffering and environmental destruction that created the globalized economy we live in today. The question 'was it worth it?' is left open for the viewer to decide.
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