In 1821 a Scottish soldier named Gregor MacGregor returned to London and announced that he had been made Cazique — a native prince — of Poyais, a territory of eight million acres on the Mosquito Coast of Central America, granted to him by King George Frederic Augustus of the Mosquito Nation.
He then published a four-hundred-page guidebook, Sketch of the Mosquito Shore, Including the Territory of Poyais, under the name of a Captain Thomas Strangeways who did not exist. It described a temperate and fertile country with fish-rich rivers, soil so productive it yielded three maize harvests a year, a capital called St Joseph with a theatre, an opera house, a cathedral and a bank, and a settled population of British colonists who required only more labor and capital.
He established a Poyaisian legation in London, appointed consuls in Glasgow and Edinburgh, issued Poyaisian banknotes printed by a genuine Scottish bank, sold land certificates, and floated a two-hundred-thousand-pound government loan on the London Stock Exchange, which traded.
There was no Poyais. The grant was a piece of paper obtained from a Mosquito king in exchange for rum and trinkets, covering unpopulated jungle.
Seven ships were fitted out. Two sailed, in September 1822 and January 1823, carrying about two hundred and fifty emigrants — including tradesmen who had sold their businesses, a man who had been appointed manager of the Bank of Poyais, and families with children. They were landed on an empty shore. There was no city, no port, no settlement of any kind, and the rainy season was beginning. About a third of them died of disease. A passing ship from British Honduras eventually took off the survivors, of whom fewer than fifty ever returned to Britain.
The mechanism worth extracting is documentary reification, and it is the reason this case sits in the guide rather than in a curiosity cabinet.
Verification is expensive and paperwork is cheap. Nobody in Edinburgh in 1822 could visit the Mosquito Coast. What they could examine was a guidebook, a banknote, a land certificate, a coat of arms, a consul with an office, and a bond trading on the exchange — and every one of those artifacts is producible by a determined person with a printer. The density of the documentation substituted for its verification, because the mind treats institutional texture as evidence of institutional existence.
Optimism bias supplied the motive. Weinstein's work quantifies what is now well established: people systematically underestimate their own probability of misfortune relative to others'. Emigrants deciding to sell everything and cross an ocean are, by selection, a group at the far end of that distribution.
And social proof closed it. Each family that booked passage was evidence to the next, and a collective decision felt like collective verification when it was collective ignorance.
Several survivors continued to defend MacGregor, and some testified for him at his later trial in France. He died in Caracas in 1845, with military honors.