Why the Indies trade left Seville

Seville had housed the Casa de Contratación, the office that regulated trade with the Indies, since 1503, and it did not lose the business quietly.[6] The two cities argued over the Casa for years. The Guadalquivir supplied the practical case against Seville: ships were getting bigger, the river was hard to sail, and merchants knew that the bay of Cádiz offered better chances for smuggling.[7]
Cádiz had been climbing the system for decades, and Seville watched it happen. The head of the Indies fleets officially moved there in 1679.[8] In March 1717 José Patiño took up the post of Marine intendant of Cádiz, two months before the official transfer of the Contratación.[9] The Consulado de Cargadores, the guild of merchants who loaded goods for the Indies, travelled south with the Casa, and together they made Cádiz the commercial and financial centre of the Carrera de Indias.[10]
Timeline
  1. 1503

    Seville gets the Casa

    The Casa de Contratación takes its seat in Seville.

  2. 1679

    Fleets start from Cádiz

    The head of the Indies fleets is officially moved to the city.

  3. 1717

    Casa and Consulado move

    The Casa de Contratación and the Consulado de Cargadores transfer to Cádiz.

  4. 1778

    Free trade

    The Reglamento de Libre Comercio ends the Cádiz monopoly.

By Seville's standards the Cádiz monopoly was brief. It ran from 1717 to 1778[2], and the decrees of 1765 and 1778 had already loosened the single-port system before the Reglamento de Libre Comercio took over.[11]

What the monopoly built in Cádiz

The monopoly filled a walled peninsula with newcomers. Cádiz grew from 30,000 people in 1709 to 77,500 in 1791[5], among them hundreds of merchants, Spanish and foreign, who came from places as far apart as Ireland, Russia and the American colonies.[12] The departure and arrival of the fleets through the bay was a public spectacle that nobody ignored.[13]

400%

Growth in Cádiz's exports between 1778 and 1788, the decade after the monopoly formally ended.
Counting outward expeditions to America shows how the trade moved:
  • 930 in the last 50 years of Seville's monopoly[4]
  • 1,188 in the 62 years of the Cádiz monopoly[4]
  • 3,949 in the 42 years of free trade that followed[14]
The jump came with free trade, not with the monopoly. Between 1778 and 1788 exports from Cádiz grew by 400 per cent and reached 72 per cent of Spain's legal exports to the colonies[3], though by the early nineteenth century the city had slipped from terminal port to intermediate port on the American routes.[15]
Merchants reinvested their gains in buildings and noble titles, and also in the trade itself, lending money at risk to finance voyages.[16] One nineteenth-century traveller pictured the merchant of earlier times climbing to his rooftop mirador to catch sight of ships returning from America.[17]

José Cadalso, a merchant's son who wrote about Spain

José Cadalso was born in Cádiz on 8 October 1741, the son of a merchant who had left for America while his wife was still pregnant and did not return until 1754.[18] The family was rich enough for him to study with the Jesuits in Paris and Madrid and to make the Grand Tour that a young gentleman of the period was expected to make.[19]
He chose the army. Cadalso was promoted colonel in 1782 and died fifteen days later at the siege of Gibraltar.[20] Between his Grand Tour and that death he wrote satire, poetry and the Cartas marruecas, a book of letters among three invented correspondents: Gazel, an Arab who arrives in Spain with a diplomatic mission, the Christian Spaniard Nuño Núñez and the old Moorish sage Ben Beley.[21]
View of Cádiz Cathedral's Neoclassical towers rising above the old town rooftops with the Atlantic beyond

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The letters look at the situation of Spain and the Spaniards through foreign eyes[22], and they reached print as a book in 1793, eleven years after the author's death.[23]
In Los eruditos a la violeta an old father tells his son, about to travel, that it would be absurd to inspect foreign countries before knowing his own.[24] Cadalso grew up with a father who had spent more than a decade across the ocean.

José Celestino Mutis, the Gaditano who crossed the ocean

José Celestino Mutis trained in Cádiz, Seville and Madrid[25], then went in 1760 to the New Kingdom of Granada in South America[26] and stayed for nearly 50 years.[27]
A modern study of his life describes a biography that runs between natural history and commerce.[28] Cargoes of quina and silver, along with a superb record of American plants, reached Europe after passing through his hands.[29]
Late-15th-century caravels and naos departing the Bay of Cádiz during the christopher columbus cadiz voyages

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In 1783 the archbishop-viceroy Caballero Góngora made real a wish Mutis had held for twenty years, a botanical expedition.[30] Mutis presided over it for 25 years, until his death in 1808[31], and its herbarium came to hold more than 24,000 plants.[32] The entomologist Edward O. Wilson found that his field notes make him the first person in the New World to study ants and their behaviour in detail.[33] Spain's government could not afford to print the Flora de Bogotá that grew out of the work, with its more than 6,000 illustrations.[34]
He is better remembered as an organiser than as a theorist. A review of his biographer's work finds no significant contribution to any single branch of science[35], but a notable mark left on Spanish science by his leadership and his gift for spreading ideas.[36]

Where the merchant city still stands

Torre Tavira is the easiest place to see the trade from above. It belongs to the palace of the Marqués de Recaño, built in 1730, and was used to monitor shipping in the bay and warn the town of approaching ships.[37] The marquis had won his title by sending his own cargo with the Flota de Indias.[38] The palace later housed a drawing school from 1787 and, in 1812, the first seat of Spain's Supreme Court.[39]
The tower stands 45 metres above sea level[40], and in 1778, the year of the free-trade rules, it was designated the official watchtower of the port.[41]
The Casa de las Cuatro Torres, built between 1736 and 1745, shows the same ambition at street level.[42] Urban ordinances allowed one lookout tower per house, so the owner built four independent houses inside one building and got four towers.[43] Rooms there were let to people waiting in the city for their ships.[44]
The old town walk includes Torre Tavira. Torre Tavira's own site speaks of 134 watchtowers[45], and the roofline outside the tower is the best summary of what the monopoly paid for.