Conspiracies of Conspiracies

It’s tempting to think that we live in an unprecedentedly fertile age for conspiracy theories, with seemingly each churn of the news cycle bringing fresh manifestations of large-scale paranoia. But the sad fact is that these narratives of suspicion—and the delusional psychologies that fuel them—have been a constant presence in American life for nearly as long as there’s been an America.

In this s...