Spain did not stumble into an empire. Within a single generation of 1492 it had a legal doctrine for taking land, a labour system for working it, and a theology for explaining both — and it kept the paperwork[1]. That archive is why the Spanish case can be audited rather than estimated.
- Span
- 1492 – 1898 (Morocco to 1956; Equatorial Guinea to 1968)
- Aztec state
- Conquered 1519–1521
- Inca state
- Conquered 1532–1572
- Potosí silver
- 1545 – 1825; ≈8 million deaths (long-run estimate)
- Indigenous collapse
- Central Mexico ≈25M → ≈1M within a century
- Enslaved Africans
- ≈1.06 million landed in Spanish America
- Philippines
- 1565 – 1898
Phase one
Conquest, 1492 – 1572
The Caribbean went first. The Taíno of Hispaniola were conscripted into gold panning under the repartimiento, and within roughly fifty years had effectively ceased to exist as a society — killed by overwork, by organised violence, and by smallpox and measles arriving into a population with no prior exposure. Bartolomé de las Casas, a Spanish friar who had himself held an encomienda before turning against the system, documented it in 1542 in terms his own church tried to suppress.
The mainland followed. Hernán Cortés reached Tenochtitlán — a lake city larger than any in Spain — in 1519; by August 1521 it had been besieged, starved and levelled, its causeways broken and its records burned. Francisco Pizarro seized the Inca ruler Atahualpa at Cajamarca in 1532, extracted a room of gold and silver as ransom, and executed him anyway. The last Inca redoubt at Vilcabamba held until 1572.
“I saw with these bodily mortal eyes cruelties so unspeakable that now I tremble as I write.”
Conquest was not lawless. Before an attack, Spanish commanders were required to read the Requerimiento aloud — a formal demand that the listeners submit to the Crown and the Church, often delivered in Spanish, sometimes from a ship, occasionally to an empty village. Refusal, or incomprehension, made the ensuing war legally just.
Phase two
Encomienda, mita and the mountain
The encomienda assigned the labour and tribute of a named Indigenous community to an individual Spaniard. The mita, adapted by Viceroy Francisco de Toledo in 1573 from an Inca rotational obligation, went further: highland villages across a vast catchment were required to send a fixed share of their adult men to Potosí, for a year at a time, generation after generation.
Cerro Rico at Potosí was the most productive silver deposit in the world and, for the men sent into it, among the most lethal places on the planet. After 1570 the refining process used mercury from Huancavelica — itself worked by conscripted labour — which poisoned refiners as reliably as the shafts crushed miners. Bolivians still call the mountain el cerro que come hombres: the mountain that eats men. The bullion financed the Habsburg wars in Europe, and through Genoese and later Dutch and English bankers it seeded the European financial system that outlived the empire that dug it.
Phase three
Slavery, caste and the Church
When the Indigenous labour force collapsed, Spain bought replacements. Roughly 1.06 million enslaved Africans were landed in Spanish American ports — Cartagena, Veracruz, Havana — and Cuba's nineteenth-century sugar boom made Spain one of the last European powers to abolish slavery in its colonies, in 1886, decades after Britain and France.
The empire also built a legal race hierarchy and painted it: the casta system ranked peninsulares, criollos, mestizos, mulatos, indios and enslaved Africans with different taxes, courts, offices and punishments attached. The Church supplied both the justification and, in the Valladolid debate of 1550–51, the only serious internal challenge to it: Las Casas against Juan Ginés de Sepúlveda, arguing over whether Indigenous Americans were rational beings with rights. No verdict was issued. The system continued.
Phase four
The Pacific and 1898
From 1565 Spain ruled the Philippines through Mexico, running the Manila galleon that traded American silver for Chinese silk and porcelain for two and a half centuries. Friar estates, forced labour drafts (polo y servicios) and tribute produced recurring revolts; the execution of José Rizal in 1896 turned a reform movement into a revolution.
In 1898 Spain lost Cuba, Puerto Rico, Guam and the Philippines — not to those independence movements but to the United States, which bought the Philippines for twenty million dollars in the Treaty of Paris and then fought a three-year war to hold what it had purchased. One empire handed the file to the next.
Today
The reckoning that has not happened
Spain has not apologised. Mexico's request in 2019 was refused, and refused again in 2021 at the 500th anniversary of the fall of Tenochtitlán. The 1976 handover of Western Sahara to Morocco and Mauritania, made without the referendum the United Nations required, is the empire's unclosed file: the territory is still listed by the UN as non-self-governing, and Spain is still its legal administering power on paper.
What has moved is language and objects. Museums in Madrid and Seville have begun relabelling collections; Mexico has repatriated some archaeological material; the 12 October holiday, once Día de la Raza, is contested annually across Latin America. None of that is restitution. The silver is spent, and the mountain is still standing.
Chronology
Key dates
1492
Columbus lands in the Bahamas; Hispaniola occupied.
1494
Treaty of Tordesillas divides the non-Christian world with Portugal.
1513
The Requerimiento is drafted as the legal preamble to conquest.
1519–1521
Conquest of the Aztec state; Tenochtitlán destroyed.
1532–1572
Conquest of the Inca state; Vilcabamba falls in 1572.
1542
New Laws restrict the encomienda; colonists revolt in Peru.
1545
Silver found at Cerro Rico, Potosí.
1550–1551
Valladolid debate: Las Casas against Sepúlveda.
1565
Conquest of the Philippines begins; Manila galleon trade opens.
1573
Toledo formalises the mita labour draft for the mines.
1810–1825
Mainland Spanish America wins independence.
1886
Slavery abolished in Cuba, Spain's last colonial slave economy.
1898
Cuba, Puerto Rico, Guam and the Philippines lost to the United States.
1968
Equatorial Guinea independent; 1976, Western Sahara handed over without a referendum.
2019 / 2021
Spain rejects Mexico's requests for an apology.
In short
Did the Spanish Empire reckon with its own record?
Only partially, and mostly by omission. The mainland conquests are taught in Spain as a founding epic, the Manila galleon trade is barely taught at all, and the twentieth-century colonies in Africa — Morocco, Equatorial Guinea, Western Sahara — sit almost entirely outside the national memory built around 1492.
The gaps are not accidental. Each one removes a body of evidence that would complicate the story: a trans-Pacific slave and tribute economy that ran for two and a half centuries, a legal debate in 1550 that Spain itself never resolved, and a decolonisation in Africa that ended without the referendum international law required.
The ledger
Three unfinished files
| File | Detail | Status |
|---|---|---|
| Manila galleon trade | 1565–1815, Acapulco–Manila silver-for-silk route | 250 years, largely untaught in Spain |
| Requerimiento | Read aloud before conquest from 1513 | Formally abandoned only in the 18th century |
| Valladolid debate | Las Casas v. Sepúlveda, 1550–1551 | No verdict was ever issued |
| Spanish Morocco | Protectorate, 1912–1956 | Rif War gas attacks, no formal apology |
| Equatorial Guinea | Colony to 1968 | Forced labour on cacao plantations documented into the 1940s |
| Western Sahara | Handed over 1975–76, no referendum held | Still listed by the UN as non-self-governing |
Figures are conservative scholarly estimates; see the sources below.
The Pacific
The galleon and the silver that went the other way
From 1565 the Manila galleons carried Mexican and Peruvian silver west across the Pacific to Manila, where it was exchanged for Chinese silk, porcelain and spices, and sailed back to Acapulco once a year for two and a half centuries. It was one of the first genuinely global trade circuits, and it was built on forced Filipino and Chinese labour: shipyards conscripted local timber cutters and carpenters under the polo y servicios labour draft, and the Parián district in Manila periodically saw massacres of Chinese merchants blamed for imagined uprisings, most severely in 1603 and 1639, each killing on the order of twenty thousand people.
None of this receives more than a paragraph in most Spanish textbooks, which concentrate almost entirely on the Atlantic conquests. The imbalance matters because the Pacific trade shows the empire operating as a mature commercial system rather than a one-off conquest — a system that outlasted the conquistadors by two centuries and still relied on coercion at every stage, from Peruvian mercury mines to Filipino shipyards.
Law and doubt
The Requerimiento and the debate Spain never closed
The Requerimiento, drafted by jurist Juan López de Palacios Rubios in 1513, was a legal document read aloud to Indigenous peoples before an attack, informing them in Spanish of the authority of the Pope and the Crown and warning that resistance made the coming war just. It was sometimes read to empty beaches, sometimes from the deck of a ship, and its absurdity was noted by Spanish contemporaries even as it remained standard procedure for decades.
The Valladolid debate of 1550–51 was the closest the empire came to a formal reckoning with that absurdity. Bartolomé de las Casas argued that Indigenous Americans were rational beings entitled to the same natural rights as Europeans; Juan Ginés de Sepúlveda argued that some peoples were natural slaves under Aristotelian doctrine and that conquest was therefore lawful. The panel of theologians convened by Charles V never issued a verdict, and the encomienda system continued largely unchanged. A live argument about whether the conquered were fully human was left formally unresolved — not decided against Las Casas, simply left open, which in practice meant the practice continued.
The missing colonies
Morocco, Equatorial Guinea, Western Sahara — the reckoning that never came
Spain's African empire is the part of its colonial record least discussed inside Spain itself. In the Rif War of 1921–27, Spanish forces used chemical weapons, including mustard gas supplied with German technical assistance, against Rif Berber villages in northern Morocco — a documented use of banned weapons against civilians that has never been the subject of an official Spanish apology or inquiry. Equatorial Guinea, a colony until 1968, ran forced-labour regimes on cacao and cocoa plantations that continued into the 1940s, decades after such practices were nominally outlawed.
Western Sahara is the most unresolved of the three. Spain withdrew in 1975–76 under the Madrid Accords, dividing the territory between Morocco and Mauritania without holding the referendum on self-determination that the United Nations had required since 1966. The territory remains on the UN list of non-self-governing territories, and Spain remains its de jure administering power under international law even though it exercises no authority there — an open file with no Spanish government, of any party, having proposed to close it.
FAQ
Frequently asked
- What was the Manila galleon trade?
- A Spanish shipping route that ran from 1565 to 1815, carrying silver mined in Mexico and Peru across the Pacific to Manila in exchange for Chinese silk, porcelain and spices, then back to Acapulco once a year. It relied on forced Filipino labour in the shipyards and periodically produced massacres of the Chinese merchant community in Manila's Parián district.
- What was the Requerimiento?
- A legal proclamation, drafted in 1513, that Spanish forces were required to read aloud to Indigenous peoples before attacking them, demanding submission to the Crown and the Church and declaring that refusal made the ensuing war lawful. It was often read in Spanish to people who could not understand it, or to empty settlements.
- Who won the Valladolid debate?
- No one, formally. Bartolomé de las Casas argued Indigenous Americans held full natural rights; Juan Ginés de Sepúlveda argued conquest was lawful under Aristotelian theory. The panel convened by Charles V in 1550–51 never issued a ruling, and the encomienda system continued.
- Did Spain use chemical weapons in Morocco?
- Yes. During the Rif War of 1921–27, Spanish forces dropped mustard gas on Rif Berber villages in the Spanish protectorate of Morocco, with technical assistance in shell production traced to German firms. No Spanish government has issued a formal apology for the campaign.
- Why did Western Sahara never get a referendum?
- Spain withdrew from Western Sahara in 1975–76 under the Madrid Accords, ceding administration to Morocco and Mauritania instead of holding the self-determination referendum the United Nations had called for since 1966. The territory is still listed by the UN as non-self-governing, and Spain remains its legal administering power on paper.
