A disquieting bit of research via the NY Times: democracies may not be as good at building in their own stability as we thought.

Political scientists have a theory called “democratic consolidation,” which holds that once countries develop democratic institutions, a robust civil society and a certain level of wealth, their democracy is secure.

For decades, global events seemed to support that idea. Data from Freedom House, a watchdog organization that measures democracy and freedom around the world, shows that the number of countries classified as “free” rose steadily from the mid-1970s to the early 2000s. Many Latin American countries transitioned from military rule to democracy; after the end of the Cold War, much of Eastern Europe followed suit. And longstanding liberal democracies in North America, Western Europe and Australia seemed more secure than ever.

But since 2005, Freedom House’s index has shown a decline in global freedom each year. Is that a statistical anomaly, a result of a few random events in a relatively short period of time? Or does it indicate a meaningful pattern?

Mr. Mounk and Mr. Foa developed a three-factor formula to answer that question. Mr. Mounk thinks of it as an early-warning system, and it works something like a medical test: a way to detect that a democracy is ill before it develops full-blown symptoms.

The first factor was public support: How important do citizens think it is for their country to remain democratic? The second was public openness to nondemocratic forms of government, such as military rule. And the third factor was whether “antisystem parties and movements” — political parties and other major players whose core message is that the current system is illegitimate — were gaining support.

Brexit and Trump provide very grim data on the third item.

Trump is also a distortion, though, because he has that tv celebrity-name recognition factor. Maybe he won because fascists are significantly more popular, or maybe he won because he was an asshole on tv for years.

But that’s very weak comfort.

According to the Mounk-Foa early-warning system, signs of democratic deconsolidation in the United States and many other liberal democracies are now similar to those in Venezuela before its crisis.

Across numerous countries, including Australia, Britain, the Netherlands, New Zealand, Sweden and the United States, the percentage of people who say it is “essential” to live in a democracy has plummeted, and it is especially low among younger generations.

I have to go have nightmares now.