Conspiracy Theory

Conspiracy theories have been around for a long time, though how long is a matter of debate. As for the concept of conspiracy theory, it might seem reasonable to expect a more exact answer about the moment of its emergence. When do we first find people talking and writing about conspiracy theories? While much of the literature points to the twentieth-century philosopher Karl Popper and his famous work The Open Society and Its Enemies (1st edition: 1945), newspaper databases allow us to locate earlier occurrences of “conspiracy theory.” They reveal that the term proliferates in newspapers from the 1870s onward, particularly after the assassination of President Garfield in July 1881. What can this discovery then tell us about the modern-day phenomenon of conspiracy theories?