Explain the motivations and technologies behind European exploration and analyze its human and ecological costs, especially for indigenous peoples.
European exploration in the 1400s and 1500s is often summarized by historians as driven by three motives: God, glory, and gold -- spreading Christianity, gaining national prestige, and pursuing wealth, especially from the spice trade, which had grown expensive because Ottoman control of Mediterranean land routes squeezed out earlier middlemen. New technology made long ocean voyages possible: the caravel, a maneuverable ship developed by the Portuguese, and instruments like the compass and the astrolabe (refined centuries earlier by Islamic scholars, week 4) for navigation. Portugal led early voyages -- Vasco da Gama reached India by sea in 1498 -- while Spain funded Christopher Columbus's 1492 voyage, which reached the Caribbean instead of the Asia he was seeking, and Ferdinand Magellan's expedition completed the first circumnavigation of the globe in 1522, though Magellan himself died along the way.
This unit has already shown that exploration carried enormous costs, especially for the peoples already living in the Americas. European diseases, especially smallpox, to which Native Americans had no immunity, killed a staggering share of the population -- in some regions, historians estimate over 90 percent died within a century of contact. The Aztec Empire (week 14) fell to Hernan Cortes in 1521 and the Inca Empire (week 15) to Francisco Pizarro in 1532-1533, aided by disease, superior weapons, and alliances with the conquered empires' own regional rivals. Forced labor systems extracted wealth from the Americas for Europe, and within decades, European powers began transporting enslaved Africans across the Atlantic to supplement the labor force -- the start of the transatlantic slave trade, a system that would grow for centuries afterward. Historians call the massive transfer of plants, animals, diseases, and people between the Americas and the rest of the world after 1492 the Columbian Exchange -- it reshaped diets and populations on every continent, for better (new crops spreading worldwide) and for tragic worse (disease and slavery) at the same time.
Mastery looks like: They can name the three exploration motives, describe the Columbian Exchange with an example in each direction, and explain at least two serious human costs of this era.
Common stumbles: Celebrating exploration's technological achievements without acknowledging its costs, or the reverse -- discussing the costs without understanding the technology and motives that enabled the era.