wunder beta🌠The Columbian Exchange: the foods that swapped hemispheres
Your plate is a reunion. Tomato and potato never met wheat and cattle until the ocean became a road.
What you’ll learn
- Two kitchens that never metSee 1491 as two isolated food systems, and Crosby’s Exchange as the moment the ocean became a road.After the Ice Age the hemispheres farmed apart. Columbus’s second voyage packed a Spanish kitchen. The return cargo would remake everyone else’s.
- The calories that went eastPlace potato, maize, cassava and sweet potato as the calorie engine of the Exchange, with Nunn and Qian’s numbers attached.American staples occupied soils Old World grains left alone. Chuño shows the Andean technology behind the tuber. FAO diets show where those calories live now.
- The flavours that rewrote the potSeparate flavour crops from calorie crops, and date tomato, chilli and cacao into the kitchens that now claim them.Yellow pomi d’oro, chilli in India by 1542, cacao plus sugar. Identity moved with the seed, not just energy.
- What the Old World planted westFollow wheat, cane, coffee, banana and rice into American ground, and connect cane to coerced labour.Old World crops often yielded more in New World climates. Sugar and coffee became American farms for European cups. Africa was in the hold as well as on the plant list.
- Beasts that remade the fieldExplain why horse, cattle, pig and sheep changed American land use so quickly.A livestock gap, not a farming gap. Horses remade the Plains. Cattle brought the plough. Pigs went feral. The field itself changed shape.
- The bill on the same shipsHold disease, plantation slavery and the potato blight on the same ledger as the swapped foods, then read a modern plate.Depopulation, twelve million abducted Africans, a clonal famine in Ireland. Tonight the plate is still a map. Some routes remain unnamed.
Questions this course answers
What did Alfred Crosby mean by the Columbian Exchange?
Crosby coined the term in 1972 for the biological collision that began with regular contact after 1492: living organisms moving both ways across the Atlantic.
Match each New World staple to the Old World place that, in Nunn and Qian’s FAO snapshot, took the most calories from it
The heaviest eaters of these American plants are often not in the Americas. That is the Exchange, still running.
Put these food-swap dates in the order they actually happened
Animals and grain go in 1493. Chilli is in India by 1542. The potato is named in 1596. The tomato recipe is 1692. Crossing the ocean was faster than becoming dinner.
What did Mattioli call the tomatoes he described in Italy in 1544?
Pomi d’oro is golden apples. Nunn and Qian, following Gould, note that this points to yellow fruit, not the red sauce tomato you expect.
About what share of the Old World’s post-adoption rise in population do Nunn and Qian attribute to the potato?
In their 2010 overview they report that the potato accounts for about 12 percent of the increase in average Old World population after adoption.
Why do Nunn and Qian highlight sugar, coffee, soybeans, oranges and bananas together?
The Americas have about 16 percent of world population and 26 percent of arable land. These crops exceed that land share in New World production, so the hemisphere has become their farm.
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