Unit 4: Transoceanic Interconnections

Transoceanic interconnections

Regular, sustained connections across oceans made possible by improved ships, navigation methods, and political-economic systems willing to fund risky voyages.

Volta (voltas)

Portuguese-style circular Atlantic sailing routes that used wind patterns to make round trips (including return voyages) possible.

Trade winds

Predictable wind belts used by Atlantic sailors to travel more reliably across the ocean.

Westerlies

Wind belts used with the trade winds to complete return legs of Atlantic sailing routes (supporting circular routes).

Monsoon winds

Seasonally reversing winds in the Indian Ocean long used to support predictable maritime trade routes.

Caravel

A relatively small, maneuverable ship associated with early Portuguese exploration, especially effective when paired with lateen sails.

Lateen sails

Triangular sails that helped ships tack against the wind; tied to long development in earlier Mediterranean worlds.

Carrack

A larger, long-voyage vessel designed for heavy cargo as ocean routes became more commercialized.

Galleon

A later, heavily armed ocean-going ship (often linked to Spanish treasure fleets), reflecting the merging of trade and warfare at sea.

Magnetic compass

A Chinese-developed navigational tool that helped sailors keep a heading when landmarks were absent.

Astrolabe

An instrument used to estimate latitude by measuring angles of the sun or stars relative to the horizon.

Dead reckoning

Estimating position based on speed and direction; commonly used for longitude but prone to compounding error.

Longitude

East-west position at sea; difficult to calculate accurately in this period, increasing navigational risk.

Latitude

North-south position; more feasible to estimate using instruments such as the astrolabe (and later tools like the cross-staff).

Sternpost rudder

A Chinese-invented steering technology that improved control and maneuverability on long open-water voyages.

Cartography

Mapmaking and geographic knowledge that increasingly became systematized by states through sponsored expeditions and protected information networks.

Maritime empire

An empire built primarily through control of sea routes, coastal ports, and overseas colonies.

Prince Henry the Navigator

A major Portuguese patron associated with state-backed financing of exploration and maritime learning.

Vasco da Gama

Portuguese explorer whose voyages helped connect routes around Africa to eastern Africa and India, expanding Portuguese reach into the Indian Ocean.

Christopher Columbus

Explorer whose voyages opened sustained European contact with the Americas under Spanish sponsorship.

Treaty of Tordesillas (1494)

Agreement between Spain and Portugal to divide claimed lands between them, shaped by Iberian rivalry.

Joint-stock company

A business structure that pooled investors’ resources to spread risk and fund expensive long-distance trade ventures.

Dutch East India Company (VOC)

A powerful joint-stock company used by the Dutch to pursue a commercial empire and control trade routes, especially in Southeast Asia.

British East India Company (EIC)

A joint-stock company that helped expand and organize British overseas trade, blurring private commerce and state power.

Mercantilism

Early modern economic idea that states should control trade and accumulate wealth (often precious metals), using regulation, tariffs, and monopolies to enrich the metropole.

Commercial Revolution

Expansion of long-distance trade and financial innovations (including more investment and banking) that helped fund exploration and empire-building.

Triangular trade

A model describing Atlantic flows linking European goods/capital, enslaved Africans transported to the Americas, and American plantation goods shipped to Europe (while real routes were more complex).

Columbian Exchange

The post-1492 transoceanic transfer of plants, animals, diseases, people, technology, and ideas among Europe, the Americas, and Africa, producing major ecological and demographic changes.

Maize (corn)

An American crop that spread widely and contributed to population growth in parts of Eurasia and Africa due to its calories and adaptability.

Potatoes

An American crop that spread across the Eastern Hemisphere and supported population growth by boosting caloric supply.

Cassava

A South American crop that spread to parts of Africa and became an important staple in some regions.

Sugar (plantation crop)

A major cash crop whose intensified cultivation in the Americas drove plantation agriculture, land use change, and enormous labor demand.

Smallpox

A Eurasian disease that spread to the Americas and contributed to severe demographic collapse, weakening resistance to conquest and colonization.

Potosí

A major Andean silver-mining center whose output became globally significant and often relied on coerced labor.

Manila galleons

Spanish transpacific shipping routes carrying American silver to Asia and bringing Asian goods (e.g., silk, porcelain) to the Americas via Manila.

Encomienda

Spanish colonial grant of the right to extract Indigenous labor or tribute; justified as protection/Christianization but often brutally exploitative in practice.

Repartimiento

A coerced labor system requiring Indigenous communities to supply workers for set periods; sometimes presented as reform but still coercive.

Mita

An Andean labor draft adapted from Inca precedents and reshaped by the Spanish, used heavily for mining (especially silver).

Viceroy

A royal governor in Spanish America responsible for overseeing large regions and supporting taxation, labor extraction, and enforcement of imperial authority.

Transatlantic slave trade

The forced transport of enslaved Africans—often from West and West-Central Africa—to the Americas at massive scale.

Middle Passage

The Atlantic crossing endured by enslaved people under horrific, highly lethal shipboard conditions.

Chattel slavery

A system in which enslaved people were treated as movable property and slavery was often made hereditary through law.

Casta system

A Spanish American social hierarchy that categorized people in part by ancestry and reinforced colonial inequality and elite power.

Peninsulares

People born in Iberia who often held top colonial offices and occupied the highest status in Spanish American hierarchies.

Creoles

People of European descent born in the Americas to Spanish parents; often wealthy and educated but typically excluded from the highest colonial positions.

Mestizos

People of mixed European and Indigenous ancestry within Spanish American colonial society.

Mulattoes

People of mixed European and African ancestry within Spanish American colonial society.

Syncretism

The blending of religious and cultural practices (often under unequal power conditions) as colonialism and exchange reshaped societies.

Maroon communities

Settlements formed by escaped enslaved people that created independent or semi-independent societies and demonstrated persistent resistance to slavery.

Pueblo Revolt (1680)

An organized Indigenous uprising in present-day New Mexico against Spanish rule, driven by religious suppression, labor demands, and political control.