- Span
- 3 August – 12 October 1492
- Place
- Palos, the Canaries, Guanahani (San Salvador), Hispaniola
- Form
- Turning point — One chain of events, read in sequence.
- Published
- 2026-08-20
What made it possible
- Portuguese voyages down the African coast had reached the Cape of Good Hope's approaches by the 1480s, so a western route to Asia was the remaining option for a rival kingdom.
- Castile's conquest of Granada in January 1492 ended a war that had consumed its revenue for a decade and freed both money and idle soldiers.
- The Atlantic wind system was already well understood from the Madeira, Azores and Canary trades: sail south to the trades, return north with the westerlies.
- Columbus's estimates of the distance to Asia were based on Ptolemy, Marco Polo and a mistaken degree length, and the Portuguese rejected them as too small.
Who acted
- Christopher Columbus
- Genoese navigator; miscalculated the circumference of the Earth by about 25 per cent in the direction that made the voyage seem feasible
- Queen Isabella I of Castile
- Funded the voyage after the conquest of Granada freed Castilian resources in January 1492
- Martin Alonso Pinzon
- Captain of the Pinta; his family's standing and money made the crew possible
- Luis de Santangel
- Royal treasurer who advanced about 1.14 million maravedis against the crown's account
Why the voyage happened in 1492
Columbus had been proposing the western route for a decade and had been turned down by Portugal, and twice by Castile's advisers who correctly judged his distances to be too short. What changed in 1492 was not the geography but the money: Granada's surrender ended the war that had absorbed Castile's revenue, and the crown could sponsor an expedition whose cost was small by the standards of a royal budget.
The total outlay was about 2 million maravedis, of which the crown advanced roughly half. The rest came from Italian merchants and from the Pinzon family. For a venture of its consequences, it was cheap — comparable in cost to a few months of a single frontier garrison.
What the landfall actually set in motion
The first voyage established the wind-circle route: south along the African coast to the Canaries, west with the trade winds, north and east home with the westerlies. That route was reliable, and being reliable made it repeatable — within twenty years the Spanish had crossed and settled the Greater Antilles and were on the mainland.
The encomienda system, introduced in Hispaniola in 1503, gave settlers the right to indigenous labour in exchange for organising tribute. Combined with the epidemic that began in 1518, it produced the demographic catastrophe that made the transatlantic slave trade appear, to its organisers, as a labour solution.
- Fleet: about 90 men, three ships, two of them caravels of about 50-60 tons.
- Outward crossing: 36 days from La Gomera to landfall.
- Second voyage (1493): 17 ships and about 1,200 people, the beginning of permanent settlement.
- Epidemic disease reaches Hispaniola: the first major smallpox outbreak is recorded in 1518.
The exchange that followed
The Columbian exchange moved crops, animals and pathogens in both directions. Potatoes, maize, tomatoes, cacao and chilli peppers went east and changed European, African and Asian diets — maize and the potato are plausibly linked to European population growth in the eighteenth century. Wheat, horses, cattle, sugar and later cotton went west, along with the plantation system that required imported enslaved labour.
The combination of the two directions is what makes 1492 a structural date rather than a symbolic one. The silver that flowed from the Americas to Seville and then to Asia, the crops that reshaped farming on four continents, and the mortality that emptied the Caribbean are all part of the same event.
Consequence: short and long
Immediately
A permanent sea route between the hemispheres was established, and Castile began building an American administration within a decade.
Over the long run
The most consequential result was biological. Populations with no prior exposure to smallpox, measles and influenza collapsed after 1518: Hispaniola's population, estimated in the hundreds of thousands in 1492, was recorded at a few hundred by the 1540s, and Mexico's central valley lost on the order of 90 per cent of its people within a century. The silver from Potosi and Mexico that followed after the 1540s financed Spanish Habsburg policy in Europe and ended up in Chinese and Ottoman markets, which is why 1492 belongs in a global economic history and not only in an Atlantic one.
The usual misconception
That Columbus set out to prove the Earth was round. Every educated European already knew that; the dispute was about the Earth's size, and Columbus was wrong. He also did not 'discover' an empty continent — the Taíno, Arawak and Carib societies he encountered were complex agricultural polities, and his own log records their numbers and their goldwork.
Sources
- Samuel Eliot Morison, Admiral of the Ocean Sea (1942) — A navigational reconstruction of the voyage by a sailor-historian.
- Felipe Fernández-Armesto, Columbus (1991) — Situates Columbus in Genoese and Iberian commercial networks.
- Noble David Cook, Born to Die: Disease and New World Conquest 1492–1650 (1998) — The epidemiological evidence for the demographic collapse.
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