The Columbian Exchange

Overview

This is a self-contained, no-technology substitute packet in which high-school students investigate the Columbian Exchange — the two-way movement of crops, animals, people, and disease between the Americas, Europe, and Africa after 1492: its causes and its effects on population, agriculture, economies, and societies across continents. Working alone with a pencil, students read short original summaries, study a diagram of the directions of exchange, do source analysis on a brief public-domain 1492 journal excerpt (creator, date, type, purpose, point of view), build a cause → exchange → effects chain, compare two sources for corroboration or contradiction, distinguish fact from interpretation and opinion, evaluate a claim, and write an evidence-based historical argument about which effect was most significant. The packet supports a ~50-minute standard version and a ~90-minute block version (the block adds a data source and extended writing). The topic includes serious human costs — disease and forced migration — which the packet handles factually and respectfully. Prompts are non-partisan and grounded in historical evidence.

Accessible version of the student activity

The full student activity is reproduced below in plain, screen-reader-friendly HTML. It reflows on phones and at 200% zoom. Write your answers on the printed packet. Items marked [BLOCK] are for the ~90-minute version only.

Start (5 minutes) — Observe a source

Public-domain excerpt — from the journal kept during the first 1492 voyage across the Atlantic, as recorded and later published (translated from Spanish): "They brought us parrots and balls of cotton and spears and many other things… They willingly traded everything they owned… They do not bear arms, and do not know them, for I showed them a sword… I saw some who had marks of wounds on their bodies." (Type: primary source, public domain, an explorer's voyage journal later published; creator: attributed to the expedition's commander; date: 1492; only short portions are shown; wording modernized in translation.)

1. Write one thing you notice about how the writer describes the people he met (what he pays attention to), and predict one living or nonliving thing that might travel from one side of the ocean to the other.
2. Why might connecting two worlds that had been separate for thousands of years change what people ate, how many people there were, or which lands they lived on? Give one reason in your own words.

Build (10–15 minutes) — Read the sources

Source A — What caused and defined the Columbian Exchange (written for this packet)

For thousands of years the Americas developed apart from Europe, Africa, and Asia, so the plants, animals, and diseases on each side of the Atlantic were largely different. After transatlantic voyages began in 1492, regular ships tied these worlds together, and living things — and germs — moved in both directions; this is the Columbian Exchange. Causes: sustained ocean voyages connecting separated continents; European kingdoms seeking trade, wealth, and land; and the building of colonies, with ships carrying people back and forth. Crops and food: from the Americas came maize (corn), potatoes, tomatoes, cassava, beans, and cacao; from the Old World came wheat, rice, sugarcane, bananas, and coffee, and new calorie-rich crops later helped populations rise in parts of Europe, Africa, and Asia. Animals: the Americas gained horses, cattle, pigs, sheep, and chickens; horses reshaped hunting, travel, and warfare for many Plains peoples. People and disease — the human cost: millions of enslaved Africans were carried across the Atlantic against their will to labor on American plantations, and diseases new to the Americas (smallpox, measles) spread rapidly among Indigenous peoples who had no prior immunity, causing catastrophic loss of life. These are sober facts of the period. (Type: original explanatory summary; focus: causes and global effects of the Columbian Exchange, after 1492.)

Source B — A market and field description (written for this packet)

This is an original summary, not a real quotation. It restates changes historians commonly describe: "Within a few generations, fields in West Africa grew American maize and cassava, and villages in Ireland and northern Europe came to depend on the American potato. In the Americas, herds of Old-World cattle and horses grazed lands where none had existed before. Sugarcane brought from across the ocean spread on American plantations worked by enslaved laborers. Foods and animals that no one on either shore had known a lifetime earlier had become part of everyday life." (Type: original summary of typical changes; creator: not a real person; focus: agricultural and social change after the exchange; not a genuine primary quotation.)

Source C — Direction-of-exchange summary [BLOCK]

An original data summary (sorted by direction) using well-established history. "Old World" means Europe, Africa, and Asia.

• Americas → Old World: maize, potatoes, tomatoes, cassava, cacao — new calorie-rich foods; populations later rose.
• Old World → Americas: wheat, sugarcane, coffee; horses, cattle, pigs — new crops and livestock reshape farming and travel.
• Old World → Americas: smallpox and measles (diseases) — catastrophic loss of Indigenous life.
• Africa → Americas: enslaved people (forced migration) — forced labor on plantations; lasting human cost.

(Type: original data summary; focus: directions of the Columbian Exchange; items are well-documented examples; the list is not exhaustive.)

Word bank

Columbian Exchange

the two-way movement of crops, animals, people, and disease between the Americas and the rest of the world after 1492.

Old World

Europe, Africa, and Asia — the lands connected before 1492.

New World

the Americas, from the viewpoint of Old-World writers of the time.

Indigenous

the original, native peoples of a place, such as the peoples of the Americas.

colony

a territory settled and controlled by a distant country.

epidemic

a disease that spreads quickly to many people in an area.

immunity

the body's ability to resist a disease it has met before.

migration

the movement of people to live in another place; "forced" migration is against a person's will.

plantation

a large farm growing one main crop, often worked by forced labor.

cause

a reason something happens; it comes before an effect.

effect

a result or consequence of a cause.

point of view

the perspective from which a source was created.

fact

a statement that can be checked and shown true or false.

interpretation

an explanation of what evidence means; reasoned from facts.

opinion

a personal belief or preference; not proven by evidence.

3. Using the diagram, name two things that moved from the Americas to the Old World and two things that moved to the Americas.

Apply (20–25 minutes) — Analyze the sources

4. Source analysis of the 1492 journal excerpt from Question 1: identify the creator, the date, and the type of source (primary or secondary? public domain?), then describe its purpose and point of view — who created it and how that might shape what it notices or leaves out.
5. Cause → exchange → effects chain: using Source A, name two causes and two effects so the chain reads from cause → the Columbian Exchange (ships carry crops, animals, people, and disease both ways) → effects.
6. Trace one complete chain in 2–3 sentences: pick a cause from Source A, explain how it drove the exchange, and name one effect on population, agriculture, economies, or societies in a specific place (the Americas, Europe, or Africa).
7. Corroborate or contradict: compare Source A (overview) and Source B (market-and-field description). Do they mostly corroborate or contradict about how crops and animals spread? Explain with one detail from each source.
8. Fact (F), interpretation (I), or opinion (O)? Mark each:
   • a) Potatoes and maize spread from the Americas to Europe, Africa, and Asia.
   • b) New calorie-rich crops probably helped some Old-World populations grow over time.
   • c) The Columbian Exchange was the most interesting event in all of world history.
   • d) Diseases such as smallpox spread among Indigenous peoples who had no prior immunity.
9. Evaluate a claim: a student claims "The Columbian Exchange only moved crops — it had nothing to do with people or disease." Do the sources support it? Choose: (A) Yes — Source A says only crops were exchanged; (B) No — Source A describes the exchange of crops and animals, people (including enslaved Africans by force), and disease (such as smallpox), not crops alone; (C) The sources never mention crops. Then explain your choice with one detail from Source A.
10. [BLOCK] Using Source C, name one item that moved from the Americas to the Old World and one that moved toward the Americas, then explain in one sentence why sorting items by direction shows that the exchange went both ways.

Explain (10–20 minutes) — Claim, Evidence, Reasoning

Question 11. Of the Columbian Exchange's effects on population, agriculture, and societies across the continents, which do you think was the most significant? Write a claim that names one effect, support it with two pieces of evidence from the sources or diagram, then explain your reasoning. There is no single "right" effect — argue from the evidence, and handle the human costs (disease, forced migration) factually and respectfully. Sentence stems: "The most significant effect of the Columbian Exchange was ______ because…"; "One piece of evidence is… (from Source A / B / C or the diagram)."; "A second piece of evidence is…"; "This evidence supports my claim because…"

[BLOCK] Extended writing: bring in a second source or diagram element as added evidence, and add a counter-consideration — name one reason someone might argue a different effect was most significant, then explain why you still hold your claim or how it changes.

Close (5 minutes) — ACE

• Articulate: explain in your own words what the Columbian Exchange was.
• Connect: point to one item in a source or on the diagram that shows a cause of the exchange and one that shows an effect; name both.
• Extend: name one food you might eat today that traveled across the ocean in the Columbian Exchange, and give one reason it connects to this history.

Continue (optional, ~15 minutes) — Early finisher

Sort an effect by continent: pick one effect named in the sources (new foods, population change, the spread of disease, or forced migration), then name which continent — the Americas, Europe, or Africa — you think it changed the most, and why, using one detail from the sources or diagram. Handle the human-cost effects seriously and respectfully.

Turn in

Hand in the whole packet with your name, class period, and date, with questions 1–11 and the ACE box answered (skip [BLOCK] items if you did the standard version). Include the optional early-finisher task if you did it.