European Exploration: Motives, Navigation & Claims · Grade 7 Social Studies
Chapter: Colonial Worlds & New YorkEuropean Exploration: Motives, Navigation & Claims
Learning goals
- I can explain what European sailors wanted and why the land routes stopped working.
- I can name the technologies that made ocean voyages survivable.
- I can explain what a European claim to American land actually rested on.
Before this unit
Locate the period and region using the supplied background and timeline. Define unfamiliar terms and distinguish a document’s assertion from an established outcome.
Use three flexible 40–45-minute sessions: background and Parts 1–2 with checks; Parts 3–4 and the worked evidence case; then remaining practice, a timeline or labeled model, revision, and the exit check. Complete one short part at a time. Embedded checks count toward the practice set, rather than duplicate homework. Workshop, review, quiz, exams, and flexible support have separate time.
The story that Columbus proved the world was round is a nineteenth-century invention. Every educated European of 1492 knew the Earth was a sphere. Eratosthenes had measured its circumference in Egypt around 240 BC and come within a few per cent of the real figure, and his result was still in the books.
What was disputed was the distance west to Asia, and Columbus got it badly wrong. He combined the smallest circumference estimate he could find with the most generous guess about how far Asia stretched eastward, and concluded that Japan lay about 2,400 nautical miles west of the Canaries. The true distance is near 10,600. His critics were right and he sailed anyway.
He survived because something unexpected lay in between. The voyage that made him famous rested on an error that would have killed him had the Atlantic been as empty as he believed.
Build your understanding
Where this fits
The last chapter ended with the exchange that followed 1492 — the crops, the diseases, the horses. This chapter goes back to ask why any European ship was in the western Atlantic at all, and then follows what the colonies they planted turned into. The nations already living here, whom you met in chapter one, do not disappear from the story; they become the other party to every claim in it.
Use three flexible 40–45-minute sessions: what Europeans wanted and the technology that let them go after it; what a claim meant and to whom; then the practice set, a sourcing task on a map or charter, revision and the exit check. Workshop, review, quiz and exams have separate time.
Part 1 · Why go at all
The short answer is pepper, and cloves, and nutmeg. Spices preserved food and disguised the taste of meat kept too long, and they came overland from south and southeast Asia through a chain of middlemen, each taking a cut. When Constantinople fell to the Ottomans in 1453 the chain became costlier and less reliable for western European buyers, and a sea route began to look worth the risk.
Portugal went first and went south. Under royal backing associated with Prince Henry, Portuguese captains worked down the African coast for decades; Bartolomeu Dias rounded the southern tip in 1488, and Vasco da Gama reached India in 1498. That is the sober answer to Columbus's proposal: Portugal already had a route that worked, which is partly why the Portuguese crown turned him down.
Spain's position was different again, and worse. Castile and Aragon had spent the fifteenth century at war on their own peninsula and had no foothold on the African route. For a crown shut out of the south, a western passage was not a wild idea but the only idea, which is why a proposal its own experts rejected on the geography could still get a hearing at court.
Behind the spices sat gold, and behind both sat a religious argument. The same monarchs who funded Columbus completed the conquest of Granada in 1492 and expelled Spain's Jews the same year. Expansion was understood by its backers as commerce and crusade at once, and the documents of the period say so openly rather than hiding it.
Pause and explain
Portugal had already reached India by sea in 1498. Why did Spain still fund a westward attempt?
Check your reasoning after answering
Because the southern route was Portugal's. Having spent decades and lives proving it, Portugal controlled the African coast and had no reason to share, so a rival crown needed a different way to the same goods. Spain was buying a chance at the trade, not a demonstration about the shape of the Earth.
Part 2 · What made the voyages survivable
Ocean sailing needed ships that could work against the wind. The caravel was small, shallow and rigged with triangular lateen sails borrowed from Arab and Mediterranean practice, which let it sail much closer to the wind than a square rig and so beat its way home against the prevailing westerlies. A ship that can only run downwind is a one-way ship.
Finding your position was the other half. The magnetic compass, which reached Europe from China by way of the Islamic world, gave direction out of sight of land. The astrolabe and later the quadrant gave latitude by measuring the angle of the sun or the pole star. Longitude could not be measured reliably at sea for another two and a half centuries, so captains sailed to the right latitude and then ran east or west along it.
Ships also had to be provisioned for the unknown. Salt beef, hard biscuit and water in casks set a hard limit on how long a crew could stay at sea, and scurvy — which nobody yet understood — began to appear after roughly six to eight weeks without fresh food. That limit is why the distance argument in this unit's task was a matter of life and death rather than academic pedantry.
None of this was European invention from nothing. The compass is Chinese, the lateen sail Arab, the astrolabe Greek by way of the Islamic world, and the mathematics behind the tables likewise. The voyages were made possible by a long exchange of technique across Eurasia, which is a useful thing to notice before reading what the voyagers said about the people they met.
Pause and explain
Why was a sail that could work against the wind more important than a bigger ship?
Check your reasoning after answering
Because it made the voyage a return journey. The Atlantic winds blow west in the trades and east further north, so a square-rigged vessel could be carried out and then be unable to beat home. The lateen rig let a caravel sail closer to the wind, which turned a crossing from a gamble into a route.
Part 3 · A claim, and who was bound by it
When a European captain went ashore, read a declaration and set up a cross or a pillar, he was performing a legal act — but only among Europeans. The ceremony told other Christian monarchs that this coast was spoken for. It had no standing with the people already living there, who were not party to it and in most cases were not present.
The framework came from Rome. Papal declarations in 1493 assigned newly encountered lands to Spain, and the Treaty of Tordesillas in 1494 redrew the line by agreement between Spain and Portugal, dividing the globe along a meridian in the Atlantic. Two European courts partitioned continents whose inhabitants they had not met. This bundle of ideas, later called the doctrine of discovery, was still being cited by United States courts in the nineteenth century.
The practical effect in this region came later. Giovanni da Verrazzano entered New York harbour for France in 1524; Henry Hudson, an Englishman sailing for a Dutch company, came up the river that now carries his name in 1609. Hudson's voyage is why the Dutch claimed this valley and why the next unit is about New Netherland.
Pause and explain
What did a flag-planting ceremony actually accomplish?
Check your reasoning after answering
It staked a claim against other European powers. The ritual was addressed to rival Christian monarchs, and the Treaty of Tordesillas shows the real audience — Spain and Portugal dividing a line between themselves in 1494. It created no obligation for the nations already living on the land, who had not agreed to any of it.
Part 4 · Reading what the explorers wrote
The accounts these men sent home are our main source for first contact, and they were written to be read by investors and monarchs. A captain reporting on a coast he hoped to be sent back to had reasons to describe it as rich, its people as friendly or as easily overcome, and his own conduct as careful. That does not make the accounts worthless, but it does tell you what to weigh.
Verrazzano's 1524 letter to the French king describes the people of the harbour, their clothing and their boats in detail, and is the earliest European description of the area. It is also a sales document addressed to the man paying for the next voyage. Both things are true at once, and the four questions from the first unit apply exactly.
Hudson's case shows how tangled the motives were. He was English, sailing in 1609 for the Dutch East India Company, under orders to find a northeast passage over Russia; he ignored them, turned west, and explored the river instead. The Dutch claim to this valley rests on an Englishman disobeying a Dutch instruction, which is a useful corrective to any neat story of national destiny.
Notice too what the sources cannot contain. No Lenape or Munsee account of watching those ships arrive survives in writing. What we have is one side's description of a two-sided meeting, which is the same problem you met with the Manhattan purchase and will meet again in every treaty in this course.
Pause and explain
Verrazzano's letter is a first-hand account by someone who was there. What should still make you cautious?
Check your reasoning after answering
Who he was writing for. The letter went to the king funding his voyages, so there was reason to make the coast sound worth returning to and his own conduct sound sound. Being present makes him a strong source for what he saw and a weak one for what he had reason to shade.
Apply the whole unit · Judge a proposal on the evidence of 1492
You advise the Spanish court in 1491. Columbus argues Japan lies about 2,400 nautical miles west of the Canaries. Your experts cite Eratosthenes, who measured the Earth's circumference around 240 BC to within a few per cent of about 21,600 nautical miles, and they put the real westward distance near 10,600.
Your task
Assess the proposal on what was known then, and explain why backing it was still defensible.
What your response should show
- States the error as roughly a factor of four against the true distance
- Connects the error to provisioning rather than treating it as abstract
- Explains the decision using Portugal's position after 1488
- Reaches a verdict that uses only what was known in 1491
Response guidance — after your attempt
State how far out Columbus's figure was, as a multiple of the true distance.
Say what that error means for a ship with provisions for a voyage of the length he predicted.
Explain why the experts were right and why the crown funded it anyway, given what Portugal had achieved by 1488.
Write a one-sentence verdict a court adviser could defend in 1491.
Columbus's 2,400 nautical miles is roughly a quarter of the real 10,600, so he was out by a factor of about four. A ship stocked for his estimate would run out of food and water around a quarter of the way to Asia, which is why the experts opposed him and why they were right. The crown funded it anyway because the cost of three small ships was low against the prize, and because Dias had rounded Africa in 1488 and locked Portugal into the southern route. The defensible verdict in 1491: the geography is wrong and the voyage will probably fail, but the sum at risk is small and the alternative is conceding the trade to Lisbon.
Read the documents and charts yourself
- Library of Congress: Verrazzano's 1524 letter and early accounts of the Atlantic coast
- Library of Congress: the Treaty of Tordesillas and the division of the Atlantic world
- National Maritime Museum: navigation instruments of the age of sail
- National Museum of the American Indian: treaties and the doctrine of discovery
Parent / teacher teaching notes
Ask for one because-statement, a dated connection, and a source limitation. Give specific feedback and time to revise. Allow notes, a glossary, oral explanations, or a labeled timeline. Evaluate context, evidence, and reasoning rather than the learner’s politics, religion, cultural identity, or agreement with the model wording. Do not require family disclosure or role-play of slavery or persecution.
The key idea
Columbus sailed west because he was wrong about the size of the Earth. Educated Europeans had known it was round for two thousand years and had measured it closely; Columbus used the smallest estimates available and still underestimated the distance to Asia by a factor of four.
Worked examples
Example 1 · Worked evidence case
- Identify movement, asserted authority, and settlement as distinct categories.
- Match each record to the claim it can support.
- Seek local and diplomatic evidence about consent and control.
Example 2 · Compare a second claim after your attempt
- Identify the relevant period, institution, or evidence category.
- Identify existing communities, their trade and diplomacy, and the encounter’s consequences. A voyager’s route is one part of a populated region’s history.
- State the narrower conclusion the supplied information can support.
Avoid these mistakes
- Mistake: A European royal claim proves that the claimed land was unoccupied.
- Mistake: An explorer’s goal establishes the actual outcome for every affected community.
- Treating all members of a community as one actor.
- Presenting a source’s stated aim as proof of everyone’s actual experience.
Check your understanding
Does a sponsor’s plan prove that a voyage achieved it?
Discuss the answer
No. It establishes a stated aim. Routes, records, exchanges, and later actions are needed to investigate what actually happened.
Why did a compass not guarantee successful colonization?
Discuss the answer
It helped with direction but did not supply food, labor, finance, accurate charts, consent, or military and political authority.
Words to know
- context
- The time, place, institutions, and conditions surrounding an event.
- primary source
- Evidence created in the period or activity being investigated; its form does not automatically guarantee accuracy.
- interpretation
- An explanation of evidence that can be compared with context and other records.
- charter
- A document granting specified authority or privileges under a government’s claim.
- navigation
- Methods and knowledge used to determine position and direct travel.
Extend the historical inquiry
If you use a linked record, identify creator, date, audience, purpose, form, and a specific claim it supports. Keep original wording separate from course paraphrase. Seek a different independently produced record that would test an inference.
In the real world
Trace a dated claim to its evidence and distinguish stated aims, institutions, and actual access. Describe people and communities without universal stereotypes.
Exit check
Why can an alliance change over time?
Check your explanation after answering
Resources, threats, leadership, trade conditions, and other relationships can change. A dated alliance is not proof of permanent agreement on every issue.
Explain your reasoning without notes. If a key idea is missing, revisit the lesson and try again.