1.4 Columbian Exchange, Spanish Exploration, and Conquest

The Columbian Exchange

The Columbian Exchange was the transfer of plants, animals, diseases, and people between the Americas, Europe, and Africa after 1492. Old World crops (wheat) and animals (horses, pigs, cattle) came to the Americas; New World crops (maize, potatoes, tomatoes) went to Europe. Diseases like smallpox devastated Native populations, who lacked immunity, causing catastrophic demographic collapse.

Spanish Motives and Methods

Spain sought "God, glory, and gold" — spreading Catholicism, gaining prestige, and extracting wealth. Conquistadors like Cortés (Aztec) and Pizarro (Inca) used superior weapons, alliances with rival native groups, and disease to conquer powerful empires. Spain established the encomienda system, granting colonists control over native labor and tribute in exchange for promises of protection and Christianization.

Effects of Conquest

Spanish conquest created a caste system (peninsulares, creoles, mestizos, natives, enslaved Africans) and the Columbian Exchange's demographic catastrophe pushed Spain to import enslaved Africans as labor replaced native populations decimated by disease. Silver from mines like Potosí fueled a global trade network, linking Spanish America into a new Atlantic World economy.

Key terms

Columbian Exchange

The transfer of plants, animals, diseases, and people between the Old World and New World after 1492.

Encomienda system

A Spanish labor system granting colonists control over native labor and tribute in exchange for promised protection and Christianization.

"God, glory, and gold"

The three main motives driving Spanish exploration: spreading Catholicism, gaining prestige, and acquiring wealth.

Hernán Cortés

Spanish conquistador who conquered the Aztec Empire in 1519–1521.

Demographic collapse

The catastrophic decline in Native American populations due to Old World diseases like smallpox, to which they had no immunity.

Try an AP-style question

The greatest demographic effect of the Columbian Exchange was…

1. mass migration of Africans to Europe
2. rapid growth of Native populations
3. Native population collapse from disease
4. declining European populations