The Museum Label: Did 1453 Destroy Europe's Overland Trade?
The Riverside History Museum is rewriting the labels for a gallery on trade between Europe and Asia, 1400-1600. A volunteer has proposed this label: The Ottoman conquest of Constantinople in 1453 destroyed Europe's overland trade with Asia and forced Europeans to find sea routes. The review team has five items to test it.
- A 1454 Venetian merchant letter complaining that tolls at Constantinople have doubled.
- Genoese customs records showing overland silk shipments through the Black Sea in 1470 at about 70% of their 1450 volume.
- A 1498 Portuguese royal ledger listing spice profits from the Cape route.
- A 1510 Ottoman customs register from Aleppo showing revenue higher than in 1450.
- An undated map of Venetian trading posts.
The gallery opens in three weeks, and the team may request only one new source before printing. Its own rule is that a printed claim needs at least two independent sources and no strong contradiction.
1. Which part of the proposed label is best supported by the five items, and which part is contradicted? Cite specific items in your answer.
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The word destroyed is contradicted twice, independently. Item 2 shows 70% of the 1450 silk volume still moving overland in 1470: reduced, not destroyed. Item 4 shows Aleppo customs revenue higher in 1510 than in 1450, which is hard to square with a dead trade (though revenue also depends on tax rates and on goods other than silk, so it is supporting evidence rather than proof).
The second half is only partly supported. Item 1 shows costs rising, which is a plausible motive. Item 3 shows a sea route existed and paid by 1498, but it does not show that overland failure forced the route; profit, rivalry with Venice, and royal ambition are all consistent with item 3.
Item 5 cannot carry weight at all: without a date, it cannot show change over time. So the defensible core is: costs rose, and Europeans pursued a sea route. The indefensible core is: destruction, and a single cause.
2. The team may request exactly one new source. What should it request, and why is it better than the strongest alternative you can name?
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Request a continuous dated series for one commodity - for example, Venetian or Ottoman customs accounts for pepper covering 1440-1520. Three reasons: it measures volume over time rather than describing one moment; it was generated routinely by officials with no interest in the museum's argument; and it can confirm or break item 2's 70% figure, which currently rests on a single record.
The strongest alternative is a merchant's account book, which gives rich detail on prices and routes. It is weaker because one firm's choices may reflect a personal route switch rather than a system-wide shift, and merchants wrote to justify their own decisions.
A second alternative, a modern textbook chapter, is secondary and adds no independent evidence - it would only repeat the sources already in the case. Two cautions belong in the request: customs records capture only taxed goods, so smuggling understates overland trade, and a series that shows volume flat until 1500 would push the sea-route effect later than the label claims.
3. Rewrite the label in two sentences that survive all five items, and name one word you would not use, with your reason.
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Acceptable rewrite: After 1453, Ottoman control raised the cost of overland trade, and European rulers began sponsoring sea routes to Asia. Overland trade continued at a smaller share of a growing total, so the sea route added a channel rather than replacing the old one.
The word to avoid is destroyed, because items 2 and 4 independently show continuity. It would also be fair to avoid forced, which asserts a single cause; item 3 shows a profitable route but not that Europeans had no alternative.
Check against the team's own rule: the rewrite rests on at least two independent sources (items 1 and 2 for rising costs and reduced but surviving volume; item 3 for the new route) and faces no strong contradiction. The rewrite is also honest about scale, since item 4 suggests Ottoman trade revenue grew rather than collapsed. For a gallery label, keep the two sentences to about 40 words and put the caveats on a panel, not in the headline.