1B - The expansion of Empire: the conquistadores
Learn how conquest in Mexico and Peru expanded the Spanish monarchy, why conquest depended on Indigenous people as well as conquistadores, and how American empire brought wealth, opportunities and new pressures to Spain before 1556.
Conquest and Indigenous alliance
The Caribbean settlements became bases for expeditions to the American mainland. Conquistadores sought wealth, rank and royal recognition, often organising ventures with private investment and expecting a share of their gains. The Crown could authorise expeditions and claim sovereignty without directing every decision. The expansion of empire therefore began through an uneasy relationship between royal authority and ambitious conquerors.
Hernán Cortés landed in Mexico in 1519. The Mexica, often called Aztecs, ruled an empire through tribute and political alliances centred on Tenochtitlan. Their power had opponents. Cortés's alliance with the Tlaxcalans and other Indigenous communities supplied soldiers, food and local knowledge on a scale that a small European expedition could not provide. Malintzin, also known as Doña Marina, helped make diplomacy possible through interpretation and cultural knowledge. Indigenous participants pursued their own interests; they were not merely passive helpers.
Spanish horses, steel weapons and firearms could confer advantages, but they did not make victory inevitable. The invaders were driven from Tenochtitlan in 1520. Smallpox then devastated the city's population, and the subsequent siege disrupted food and water. Tenochtitlan fell in 1521 through a combination of renewed military assault, Indigenous alliances, disease and deprivation.
The order of events supports a causal distinction. Spanish technology was an advantage; alliances supplied a crucial enabling condition; epidemic disease weakened resistance; the siege was the immediate means of victory. Selecting one factor without explaining its connection to the others produces a less convincing account.
Peru and the limits of victory
Francisco Pizarro exploited a different political opportunity in Peru. The Inca Empire had been weakened by epidemic disease and a civil war between the rival rulers Atahualpa and Huáscar. Pizarro seized Atahualpa at Cajamarca in 1532, using a surprise attack. Holding the ruler created leverage over a political system in which personal authority mattered greatly. The Spaniards collected an immense ransom but executed Atahualpa in 1533 and occupied Cuzco that year.
Capturing a ruler did not amount to immediate control of every community or region. Manco Inca led a major rebellion in 1536, and resistance continued from a separate Inca centre at Vilcabamba. Indigenous allies and intermediaries again helped Spaniards govern, while disputes between Pizarro's and Diego de Almagro's followers produced violence among the conquerors themselves. Expansion required ongoing military and political work after the celebrated initial victories.
The contrast with Mexico explains why no single formula accounts for conquest. Cortés relied on coalition building and siege warfare against the Mexica capital; Pizarro took advantage of civil war and seized an emperor. Both benefited from disease and local divisions, but the mechanisms differed. Their individual decisions were significant because they exploited conditions they had not themselves created.
For the monarchy, conquest enlarged claims to territory and resources. For Indigenous populations it brought invasion, disruption and colonial subordination, alongside continuing resistance and attempts to defend rights. Measuring empire only through the fortunes of successful Spaniards conceals the costs and the limits of Spanish control.
Royal government and colonial labour
Charles's government sought to turn conquest into a monarchy governed through institutions. The Council of the Indies, established in 1524, advised on American affairs. Audiencias combined judicial functions with oversight, while viceroys represented the king: New Spain received a viceroyalty in 1535 and Peru in 1542. Distance made communication slow, so these institutions still depended on local officials, settlers and Indigenous elites.
Encomienda
A royal grant allowing a colonist to receive tribute and, in many settings, labour from specified Indigenous communities, with obligations including protection and Christian instruction. It was not legal ownership of those people or an automatic grant of their land.
In practice, encomienda and other labour demands could produce severe exploitation. Missionaries such as Bartolomé de las Casas challenged abuses and argued for Indigenous rights. Christian conversion justified empire to many Spaniards, but it also provided a language in which critics could condemn enslavement and mistreatment. The moral debate was therefore part of Spanish imperial development, not simply an external attack on it.
The New Laws of 1542 sought to restrict Indigenous enslavement and curtail encomenderos' power, including hereditary claims. Resistance in Peru under Gonzalo Pizarro showed that colonial elites could oppose royal reform with force. Some provisions were modified, and rebellion was defeated in 1548. The outcome strengthened royal authority without ending exploitation.
The Crown had several interests at once: protecting subjects, encouraging conversion, securing tribute and preventing conquerors from becoming independent lords. This helps explain why legislation could be ambitious while enforcement remained compromised. A law records an intention and a legal claim; its existence alone does not establish the conditions under which people lived.
Trade and precious metals
American commerce created an Atlantic focus within the Spanish economy. The Casa de Contratación, founded in Seville in 1503, regulated shipping, passengers and trade. Seville benefited from its role as the authorised gateway, while merchants, shipbuilders and producers elsewhere supplied voyages and colonial markets. Legal monopoly did not mean that every profit belonged to the king or that foreign merchants were absent from the commercial networks.
Gold was important in the earlier conquests and Caribbean economy. The discoveries at Potosí in 1545 and Zacatecas in 1546 then opened major sources of silver. Their full expansion developed over subsequent decades, so the largest later silver flows should not be projected backwards onto Charles's early reign. The Crown received duties and a share of mining output, including the royal fifth where applicable; private owners and merchants received much of the remainder.
American demand offered markets for Spanish wine, oil, cloth and equipment. Imported bullion could finance purchases and support royal borrowing. Yet borrowing against expected income could commit treasure before it arrived, while part of the money passed abroad to bankers, suppliers and armies. More bullion entering Spain did not necessarily mean more money available for domestic investment.
Prices rose during the sixteenth century. Precious metals contributed to the increased supply of money, but population growth, demand for food and limits on production also mattered. The “price revolution” therefore cannot be explained as American silver acting alone. Nor did rising prices affect everyone alike: sellers and some asset owners could gain, while households whose wages failed to keep pace lost purchasing power.
Opportunity and social pressure
Empire altered opportunities in Spain unevenly. Merchants connected to Seville and colonial markets could grow wealthy. Officials, clergy, soldiers and migrants found careers overseas, while successful returnees could seek land, prestigious marriages or recognition as gentlemen. Conquest promised social advancement, but many expeditions and businesses failed. The spectacular fortunes of a few cannot represent every migrant's experience.
The movement of people and goods also changed cultural horizons. American plants and commodities reached Europe, while reports of unfamiliar societies stimulated debate about religion, law and legitimate government. These exchanges occurred alongside coercion and exploitation: they should not be presented as a balanced encounter between parties with equal power. Enslaved Africans were transported to Spanish colonies, even as the Crown legislated against Indigenous slavery.
Within Spain, new Atlantic wealth coexisted with familiar inequalities. Noble and ecclesiastical privilege remained, many peasants bore heavy obligations, and poorer urban households were vulnerable to food prices. Empire did not automatically dissolve the hierarchy of status or make all regions equally prosperous. Castile's link to American administration and commerce was stronger than that of much of the Crown of Aragon.
Weighing the impact on Spain
An original practice interpretation could argue: “The New World transformed Spain by making overseas wealth the basis of royal power.” The interpretation identifies a real change: conquest and mining gave the monarchy access to new revenues and lenders greater confidence in future receipts. It becomes too sweeping if it implies that ordinary Castilian taxation ceased to matter, that all bullion was royal income, or that wealth arrived without commercial and military obligations.
Evidence should test those precise claims. Seville's growth supports commercial transformation. The relatively late discovery of Potosí and Zacatecas limits the argument for the whole period from 1516. The persistence of privileged estates and peasant obligations qualifies a claim of equally rapid social transformation. A convincing judgement can recognise major changes in international reach and opportunities while identifying continuity in domestic structures.
The decisive distinction is between expansion of imperial resources and improvement in the condition of all Spaniards. The former was substantial by 1556; the latter varied by group and place. Empire helped Spain become a Great Power, but it did not resolve the economic and social problems that Philip II inherited.
Conquest added territory and revenue, but its domestic impact depended on who received income, where it was spent and which groups bore the costs.