What’s the reason for this? There’s no shortage of speculation. Political scientists talk about the fragility of presidential systems. Sociologists explicate the culture wars. Historians note the widening divide between the parties after white Southerners abandoned the Democratic Party following the civil rights era. Reporters will regale you with stories about the impact of Rush Limbaugh and Newt Gingrich.

Theory #1: Americans Have Gone Crazy With Conspiracy Theories

It’s probably illegal to talk about the American taste for conspiracy theorizing without quoting from Richard Hofstadter’s famous essay, “The Paranoid Style in American Politics.” It was written in 1964, but this passage (from the book version) about the typical conspiracy monger should ring a bell for the modern reader:

He does not see social conflict as something to be mediated and compromised, in the manner of the working politician. Since what is at stake is always a conflict between absolute good and absolute evil, the quality needed is not a willingness to compromise but the will to fight things out to a finish. Nothing but complete victory will do.

Or how about this passage from Daniel Bell’s “The Dispossessed”? It was written in 1962:

The politics of the radical right is the politics of frustration—the sour impotence of those who find themselves unable to understand, let alone command, the complex mass society that is the polity today…Insofar as there is no real left to counterpoise to the right, the liberal has become the psychological target of that frustration.

In other words, the extreme right lives to own the libs. And it’s no coincidence that both Hofstadter and Bell wrote about this in the early ’60s: That was about the time that the John Birch Society was gaining notoriety and the Republican Party nominated Barry Goldwater for president. But as Hofstadter in particular makes clear, a fondness for conspiracy theories has pervaded American culture from the very beginning. Historian Bernard Bailyn upended revolutionary-era history and won a Pulitzer Prize in 1968 for his argument that belief in a worldwide British conspiracy against liberty “lay at the heart of the Revolutionary movement”—an argument given almost Trumpian form by Sam Adams, who proclaimed that the British empire literally wanted to enslave white Americans. Conspiracy theories that followed targeted the Bavarian Illuminati, the Masons, Catholics, East Coast bankers, a global Jewish cabal, and so on.

But because it helps illuminate what we face now, let’s unpack the very first big conspiracy theory of the modern right, which began within weeks of the end of World War II.

In 1945 FDR met with Joseph Stalin and Winston Churchill at Yalta with the aim of gaining agreement about the formation of the United Nations and free elections in Europe. In this he succeeded: Stalin agreed to everything FDR proposed. When FDR returned home he gave a speech to Congress about the meeting, and it was generally well received. A month later he died.

Needless to say, Stalin failed to observe most of the agreements he had signed. He never had any intention of allowing “free and fair” elections in Eastern Europe, which he wanted as a buffer zone against any future military incursion from Western Europe. The United States did nothing about this, to the disgust of many conservatives. However, this was not due to any special gutlessness on the part of Harry Truman or anyone in the Army. It was because the Soviet army occupied Eastern Europe when hostilities ended and there was no way to dislodge it short of total war, something the American public had no appetite for.

And there things might have stood. Scholars could have argued for years about whether FDR was naive about Stalin, or whether there was more the US and its allies could have done to push Soviet troops out of Europe. Books would have been written and dissertations defended, but not much more. So far we have no conspiracy theory, just some normal partisan disagreement.

But then came 1948. Thomas Dewey lost the presidency to Harry Truman and Republicans lost control of the House. Soon thereafter the Soviet Union demonstrated an atomic bomb and communists overran China. It was at this point that a normal disagreement turned into a conspiracy theory. The extreme right began suggesting that FDR had deliberately turned over Eastern Europe to Stalin and that the US delegation at Yalta had been rife with Soviet spies. Almost immediately Joe McCarthy was warning that the entire US government was infiltrated by communists at the highest levels. J. Robert Oppenheimer, the architect of the Manhattan Project, was surely a communist. George Marshall, the hero of World War II, was part of “a conspiracy on a scale so immense as to dwarf any previous such venture in the history of man.”

Like most good conspiracy theories, there was a kernel of truth here. Stalin really did take over Eastern Europe. Alger Hiss, part of the Yalta delegation, really did turn out to be a Soviet mole. Klaus Fuchs and others really did pass along atomic secrets to the Soviets. Never mind that Stalin couldn’t have been stopped; never mind that Hiss was a junior diplomat who played no role in the Yalta agreements; never mind that Fuchs may have passed along secrets the Soviets already knew. It was enough to power a widespread belief in McCarthy’s claim of the biggest conspiracy in all of human history.

There’s no polling data from back then, but belief in this conspiracy became a right-wing mainstay for years—arguably the wellspring of conservative conspiracy theories for decades. Notably, it caught on during a time of conservative loss and liberal ascendancy. This is a pattern we’ve seen over and over since World War II. The John Birch Society and the JFK assassination conspiracies gained ground after enormous Democratic congressional victories in 1958 and again in 1964. The full panoply of Clinton conspiracies blossomed after Democrats won united control of government in the 1992 election. Benghazi was a reaction to Barack Obama—not just a Democratic win, but the first Black man to be elected president. And today’s conspiracy theories about stealing the presidential election are a response to Joe Biden’s victory in 2020.

How widespread are these kinds of beliefs? And has their popularity changed over time? The evidence is sketchy but there’s polling data that provides clues. McCarthy’s conspiracy theories were practically a pandemic, consuming American attention for an entire decade. Belief in a cover-up of the JFK assassination has always hovered around 50 percent or higher. In the mid-aughts, a third of poll respondents strongly or somewhat believed that 9/11 was an inside job, very similar to the one-third of Americans who believe today that there was significant fraud in the 2020 election even though there’s no evidence to support this. And that famous one-third of Americans who are skeptical of the COVID-19 vaccine? In 1954 an identical third of Americans were skeptical of the polio vaccine that had just become available.

So how does QAnon, the great liberal hobgoblin of the past year, measure up? It may seem historically widespread for such an unhinged conspiracy theory, but it’s not: Polls suggest that actual QAnon followers are rare and that belief in QAnon hovers at less than 10 percent of the American public. It’s no more popular than other fringe fever swamp theories of the past.

It’s natural to believe that things happening today—to you—are worse than similar things lost in the haze of history, especially when social media keeps modern outrages so relentlessly in our faces. But often it just isn’t true. A mountain of evidence suggests that the American predilection for conspiracy theories is neither new nor growing. Joseph Uscinski and Joseph Parent, preeminent scholars of conspiracy theories, confirmed this with some original research based on letters to the editors of the New York Times and the Chicago Tribune between 1890 and 2010. Their conclusion: Belief in conspiracy theories has been stable since about 1960. Along with more recent polling, this suggests that the aggregate belief in conspiracy theories hasn’t changed a lot and therefore isn’t likely to provide us with much insight into why American political culture has corroded so badly during the 21st century.

Theory #2: It’s All About Social Media

How about social media? Has it had an effect? Of course it has. New media always has a political effect. Newspapers and pamphlets were the first purveyors of mass politics. The movie industry invented the attack ad. Radio was crucial to Hitler’s rise to power. TV brought the civil rights movement and the Vietnam War into our living rooms—along with lasting conflict over both. In the case of social media, however, we got more than just a new way of being told about the world. We got a medium controlled by ordinary people, the first one that truly gave us a close look at precisely who we all are.

And what is it we saw? Lots of people spreading rumors and lies that range from the merely dumb to the truly foul. And, particularly in the hands of extremists pushing an agenda, those lies spread fast. Republican activist Amy Kremer promoted a “Stop the Steal” Facebook page the day after the 2020 election. By the time it was shut down a day later, it already had 320,000 fans.

And how does it affect what we learn about politics? This obviously depends on how much political news we get from social media in the first place, which turns out to be surprisingly little—at least when it comes to actual articles or broadcast segments, not hot takes from your Uncle Bob. Pew Research found that among Republicans, only 10 percent said they like seeing lots of political posts. Nieman Labs, which has twice sampled news feeds from a small selection of Facebook users, found that their samples contained very little news at all and exactly zero “fake news”—i.e., bogus articles designed to look like real journalism. That doesn’t mean fake news doesn’t exist, but it does suggest that it’s less pervasive than most people think.

As for social media’s role in stoking political rage specifically, there’s no research that directly measures this. Studies using data compiled before 2016 suggested that social media didn’t cause political polarization and had little or no effect on the accuracy of political beliefs. However, in a more recent study, researchers provided evidence for something we all knew intuitively: Social media users are mostly locked inside “bubbles” of like-minded partisans. And there’s evidence—from Facebook itself—that the company’s various algorithms push people further into bubbles. A 2016 internal report states that “64% of all extremist group joins are due to our recommendation tools…Our recommendation systems grow the problem.” A large study recently published by the Proceedings of the National Academy of Sciences found that people were much more likely to share posts from news organizations or members of Congress that referred to their political out-group—i.e., the opposite party. And when it comes to Facebook at least, the company’s algorithms reflect or reward hyperpartisan outrage mostly from one side of the spectrum—a daily tally of Facebook’s top 10 engaged posts is always massively dominated by Fox News hosts and other far-right commentators.

Regardless, social media can’t be the main explanation for a trend that started 20 years ago. When you’re faced with trying to account for a sudden new eruption on the political scene like Donald Trump, it’s easy to think that the explanation must be something shiny and new, and social media is the obvious candidate. This is doubly true for someone whose meteoric rise was fueled by his deranged Twitter account. But the evidence simply doesn’t back that up. Trump may have taken advantage of rising political anger, but it wasn’t social media that created that anger. It was, as we’ll see, something older and more cold-blooded.

Theory #3: Things Really Have Gotten Worse

In some ways, this is the most obvious possibility. Maybe we’ve all gotten angrier as a natural reaction to things getting worse. Manufacturing jobs disappeared after we granted China permanent most-favored-nation status in 2001. Middle-­class incomes stagnated during most of the early 21st century. And if you’re a conservative, you’ve had to accept a steady liberalization of cultural norms, peaking in 2015 when the Supreme Court ruled that same-sex marriage was legal nationwide.

But to what extent have these changes actually affected public sentiment? Surprisingly little, it turns out.

Partly this is because, contrary to conventional wisdom, a lot of things have gotten better, not worse, over the past few decades. Income inequality has risen dramatically, but wages for nonmanagerial workers have nonetheless gone upby about $4 per hour since 2000. Prior to the pandemic, unemployment had fallen to historic lows. Crime rates had fallen by half since their peak in the 1990s. Poverty had declined.

All of these improvements are reflected in widely available surveys of public attitudes. Job satisfaction? It’s been stable for half a century. Satisfaction with personal finances? Also stable. And most importantly, general happiness about life has been stable too, with those saying they’re dissatisfied with their personal life ranging between 10 percent and 20 percent over the past 40 years. There’s simply very little evidence that the American public has become less happy about its concrete material condition.

But broad averages sometimes conceal strong feelings over specific issues. Republicans, for example, insist that the middle class is outraged over high taxes. However, this hardly squares with the fact that taxes have gone down steadily since the 1980s.

Could the increased anger be about job loss? Probably not: The number of people who don’t have a job but want one—the most accurate measure of true employment discouragement—has remained basically steady for decades.

How about unauthorized immigration? Fearmongering about it was certainly a cornerstone of Donald Trump’s 2016 campaign but there’s little concrete evidence that it has been driving the long-term rise in political anger, in part because actual unauthorized immigration has been falling since 2007. Gallup polling confirms that aside from brief periods, the number of people who say that illegal immigration is a major issue has stayed pretty much constant for the past 20 years.

How about racism? It’s always been fundamental to American politics, all the more so following the Black Lives Matter protests of last year. But data from the General Social Survey, which has been conducted every two years since the early ’70s, shows that, without exception, racial bias among white respondents has either stayed the same or declined substantially over the past several decades. Crucially, Black respondents seem to agree. An especially interesting study published in 2011 asked people how strong they thought anti-Black racism was in each decade since 1950. Everyone agreed that racism was far worse in the 1950s than it is now. Black respondents were less optimistic than white respondents about the decline in racism, but on a scale of 1 to 10 they nonetheless rated the 1950s a 10 and the late 2000s a 6.

What do we know about more recent views of racism? One thing we know for sure is that both white and Black Americans have gotten more pessimistic about race relations since the Ferguson protests in 2014. But do they think that racism itself has gotten worse, especially following George Floyd’s murder and the racial justice protests of last year? Interpreting recent polling data is tricky, but my tentative read of the data is that it shows a welcome increase in the number of people who are aware of long-standing racist practices—especially in the criminal justice system—but not an increase in the number of people who think these practices have gotten worse.However, there’s one thing worth noting: Whether it’s in the 2011 study or more recent data, white respondents believe that anti-white bias has been steadily increasing. And the American National Election Studies, among other polls, have showed this belief in so-called reverse racism is overwhelmingly driven by white Republicans. This trend starts before 2000, but it’s growing and is an obvious candidate to explain rising white anger—as long as there’s something around to keep it front and center in the minds of white people.

So What’s Changed?

So far there are a few things we can say with some confidence:

Collectively, we are no more conspiracy-minded today than we have been in the past. Social media makes it harder to ignore this aspect of American society, and may have even accelerated it, but there’s little evidence that social media is the main driver.

What accounts for this? It’s here that our popular explanations run aground. It can’t be all about a rise in conspiracy theories, since they’ve been around for decades. It can’t be social media, since Facebook and Twitter have become popular in the political arena only over the past few years. It can’t be a decline in material comfort, since incomes and employment have steadily improved over the past couple of decades. It can’t really be social trends, since most of them have improved too. And most of the specific issues that might cause alarm—immigration, racism, and more—are unlikely candidates on their own. They may be highly polarizing, but in a concrete sense they haven’t gotten worse since 2000. In fact, they’ve mostly gotten better.

To find an answer, then, we need to look for things that (a) are politically salient and (b) have changed dramatically over the past two to three decades. The most obvious one is Fox News.

When it debuted in 1996, Fox News was an afterthought in Republican politics. But after switching to a more hardline conservatism in the late ’90s it quickly attracted viewership from more than a third of all Republicans by the early 2000s. And as anyone who’s watched Fox knows, its fundamental message is rage at what liberals are doing to our country. Over the years the specific message has changed with the times—from terrorism to open borders to Benghazi to Christian cake bakers to critical race theory—but it’s always about what liberal politicians are doing to cripple America, usually with a large dose of thinly veiled racism to give it emotional heft. If you listen to this on a daily basis, is it any wonder that your trust in government would plummet? And on the flip side, if you’re a progressive watching what conservatives are doing in response to Fox News, is it any wonder that your trust in government might plummet as well?

Fox News isn’t the only source of conservative animus toward government. The conservative media ecosystem includes talk radio, websites, email newsletters, and so forth. But all of these outlets had only a temporary effect in the early ’90s before fading out in the face of a booming economy. Only Fox News has had an enduring impact.

Why is Fox News so influential? Part of the answer probably lies in the fact that Fox News is cloaked in the trappings of news. Most conservatives who listen to talk radio shows understand that radio talkers are explicitly offering opinions and doing it with a large element of showmanship. But Fox News has well-dressed anchors and all the other accoutrements of a normal news outlet. So it’s no surprise that 65 percent of Republicans and Republican-leaning independents say they trust Fox News—far more than any other news outlet. After all, why would a news outlet lie?

To an extent that many people still don’t recognize, Fox News is a grinding, daily cesspool of white grievance, mistrust of deep-state government, and a belief that liberals are literally trying to destroy the country out of sheer malice. Facebook and other social media outlets might have made this worse over the past few years—partly by acting as a sort of early warning system for new outrages bubbling up from the grassroots that Fox anchors can draw from—but Fox News remains the wellspring.

The Fox of 2021 is different even than the Fox of 2019…I had a commentator say to me, “Fox is a really different place than it was preelection.” This person has seen changes even in the last six months, in terms of how radical, how extreme the content is. I had a Fox staffer, as I was writing the last page of the paperback, say, “The Biden team has no idea what they’re up against.” Maybe in three years, we’ll say that Fox was immaterial to the Biden presidency. Maybe we’ll say that Fox barely made a dent. But it won’t be for lack of trying.

It is Fox News that has torched the American political system over the past two decades, and it is Fox News that we have to continue to fight.