Latest / The Rise of Colonialism: How Europe Divided the World — Fexingo History / The Treaty of Tordesillas Line: How One Ruler Split the Globe
Transcript
- Lucas: So we've been tracing how Europe carved up the world — from the papal bulls to the Berlin Conference. But before there were imperial borders drawn on maps, there was one single line that started it all. The Treaty of Tordesillas. Luna: The one that split the globe between Spain and Portugal, right? Lucas: Exactly. But what's often missed is that the line wasn't just a static mark — it was a political weapon, a scientific headache, and a compromise that neither side truly believed in. And the man who really maneuvered it into place was King John II of Portugal. Lucas: Now, I want to say something about this podcast before we dive in. We keep these episodes free and without ads, and that's a deliberate choice. If you want to support that, there's a link — buy me a coffee dot com slash fexingo. No pressure, just a way to keep going. Luna: Yeah, it matters to me that this is ad-free. It keeps the conversation honest. Lucas: It does. Okay, so back to 1493. Columbus had just returned from his first voyage, and both Spain and Portugal were claiming the same Atlantic waters. The pope at the time, Alexander VI — a Spaniard, by the way — issued a series of bulls, the most famous being Inter caetera, which drew a line 100 leagues west of the Cape Verde islands. Everything west of that went to Spain; everything east, to Portugal. Luna: Wait, a line 100 leagues west — but how did they even measure that on a map? Lucas: That's the thing — they couldn't. Longitude was essentially guesswork. But John II, the Portuguese king, wasn't happy with that line. He felt it gave too much to Spain. So he opened direct negotiations with the Spanish monarchs, Ferdinand and Isabella, bypassing the pope entirely. Lucas: And here's where his cunning comes in. He pushed to move the line much farther west — from 100 to 370 leagues west of Cape Verde. On the surface, that looks like he's giving Spain more ocean. But John knew something the Spanish didn't: Portuguese navigators had been making secret voyages down the African coast, and they had intel on lands that might lie east of that new line. The Treaty of Tordesillas, signed in June 1494, accepted his terms. Luna: So he was playing chess while Spain was playing checkers. Lucas: Pretty much. The treaty also stipulated that the line would run from pole to pole, cutting through the Atlantic. And it explicitly allowed Portugal to claim anything they'd already discovered east of it — which, as it turned out, included a chunk of South America that would become Brazil, though that only became clear later. Lucas: Now, the treaty was a bilateral agreement, but it was rooted in papal authority. Alexander VI had to approve it, and he did, but there was a catch — the line's exact longitude was never defined. No one could agree on which meridian to measure from. Different maps showed it in different places, and that ambiguity would create headaches for centuries. Luna: Like, did they ever figure out where the line actually ran? Lucas: Not really. The Spanish tried to maintain their interpretation, and Portugal their own. But by the 1520s, they had to deal with the Pacific side too, because both were eyeing the Moluccas — the Spice Islands. That led to the Treaty of Zaragoza in 1529, which drew a line in the Pacific, essentially splitting the world into two hemispheres. Lucas: So you've got Tordesillas for the Atlantic, Zaragoza for the Pacific, and together they created a kind of global apartheid. But here's what I find fascinating: the line wasn't just a political boundary — it became a scientific problem. To enforce it, you needed to know your longitude at sea, and that problem wasn't solved until the chronometer in the 18th century. Luna: So for like two hundred years, they were just arguing over where the line was, without being able to measure it. Lucas: Exactly. And that's not just an abstract point. It meant that ships sailing between Europe and the Indies had to navigate within a claimed zone, and any captain who crossed the line without permission could be seized. That's why the Spanish set up the Casa de Contratación in Seville — to control all navigation to the Americas, and they kept a master map, the Padrón Real, updated with every new discovery. Lucas: But the Portuguese, of course, had their own mapping operations, and they were just as secretive. It was a spy game of cartography, with each side trying to out-map the other. And the line itself? It wasn't a physical boundary on the ocean, but it had real teeth. Treaties, wars, and colonial administrations all traced their legitimacy back to that scribble on a chart. Luna: It's wild to think that a line on a map, drawn with so much uncertainty, shaped the languages spoken in the Americas today. Lucas: That's the thing — Tordesillas didn't just affect the 16th century. It set the pattern for how European powers divided the non-European world. The Berlin Conference in 1884 drew lines across Africa with even less knowledge of the terrain. So in that sense, Tordesillas was the template. Lucas: Now, one more layer. The papal bulls that preceded the treaty are often cited as the basis for European claims to indigenous lands. The doctrine of discovery, as it came to be called, gave Christian nations the right to claim territories not ruled by Christian princes. That had devastating consequences for the people already living in those places, and it's a legacy that's still being debated in courts today. Luna: I never thought of Tordesillas as having that kind of legal weight. Lucas: Oh, absolutely. In the 1823 Supreme Court case Johnson v. McIntosh, the U.S. Supreme Court used the doctrine of discovery to justify taking lands from Native Americans. And that doctrine traces directly back to the papal bulls and the treaty. So it's not just history — it's living law in some places. Lucas: But there's also a more personal side. Imagine being a navigator in 1494, sailing into the unknown, knowing that your course, your measurements, your life's work — all of it could be deemed illegal if you strayed across an invisible line. That pressure must have been immense. Luna: And yet they still went, because the spice trade was that lucrative. Lucas: Right. Clove and nutmeg were worth more than gold per ounce. So the stakes were enormous. And the line itself? It was a fiction that became fact because enough people believed in it and enforced it. That's the power of a good map — it doesn't just describe the world; it creates it. Lucas: So when we look back at Tordesillas, it's not just about a treaty signed by two kingdoms. It's about the moment when the world became a surface to be divided, measured, and controlled. And that mindset, once established, never really went away. Luna: I'll never look at a map the same way again. Lucas: That's a good takeaway. Next time we might look at how that line actually played out in a specific place — like Brazil, where the Portuguese used the treaty to claim land they'd never even seen. Luna: Yeah, I'd love that. Lucas: Until then — keep exploring.