When a new coronavirus emerged in China and began spreading around the world, including in the United States, President Donald Trump’s many critics in the American foreign-policy establishment were quick to identify him as part of the problem. Trump had campaigned on an “America first” foreign policy, which after his victory was enshrined in the official National Security Strategy that his administration published in 2017. At the time, I served in the administration and orchestrated the writing of that document. In the years since, Trump has been criticized for supposedly overturning the post–World War II order and rejecting the role the United States has long played in the world. Amid a global pandemic, he’s being accused—on this site and elsewhere—of alienating allies, undercutting multinational cooperation, and causing America to fight the coronavirus alone.

Three months ago, no one knew that SARS-CoV-2 existed. Now the virus has spread to almost every country, infecting at least 446,000 people whom we know about, and many more whom we do not. It has crashed economies and broken health-care systems, filled hospitals and emptied public spaces. It has separated people from their workplaces and their friends. It has disrupted modern society on a scale that most living people have never witnessed. Soon, most everyone in the United States will know someone who has been infected. Like World War II or the 9/11 attacks, this pandemic has already imprinted itself upon the nation’s psyche.

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A global pandemic of this scale was inevitable. In recent years, hundreds of health experts have written books, white papers, and op-eds warning of the possibility. Bill Gates has been telling anyone who would listen, including the 18 million viewers of his TED Talk. In 2018, I wrote a story for The Atlantic arguing that America was not ready for the pandemic that would eventually come. In October, the Johns Hopkins Center for Health Security war-gamed what might happen if a new coronavirus swept the globe. And then one did. Hypotheticals became reality. “What if?” became “Now what?”

From inside her living room in London, Paula Koelemeijer can feel the world around her growing quieter.

Koelemeijer, a seismologist, has a miniature seismometer sitting on a concrete slab at the base of her first-floor fireplace. The apparatus, though smaller than a box of tissues, can sense all kinds of movement, from the rattle of trains on the tracks near Koelemeijer’s home to the waves of earthquakes rolling in from afar. Since the United Kingdom announced stricter social-distancing rules last month, telling residents not to leave their home except for essential reasons, the seismometer has registered a sharp decrease in the vibrations produced by human activity.

With fewer trains, buses, and people pounding the pavement, the usual hum of public life has vanished, and so has its dependable rhythms: Before the spread of COVID-19 shut down the city, Koelemeijer could plot the seismometer’s data and see the train schedule reflected in the spikes, down to the minute. Now, with fewer trains running, the spikes seem to come at random.

Fear sweeps the land. Many businesses collapse. Some huge fortunes are made. Panicked consumers stockpile paper, food, and weapons. The government’s reaction is inconsistent and ineffectual. Ordinary commerce grinds to a halt; investors can find no safe assets. Political factionalism grows more intense. Everything falls apart.

This was all as true of revolutionary France in 1789 and 1790 as it is of the United States today. Are we at the beginning of a revolution that has yet to be named? Do we want to be? That we are on the verge of a major transformation seems obvious. The onset of the next Depression, a challenge akin to World War II, a national midlife crisis—these comparisons have been offered and many more. But few are calling our current moment a revolution, and some have suggested that the coronavirus pandemic—coinciding as it has with the surge in Joe Biden’s bid for the Democratic presidential nomination and the decline of Bernie Sanders’s—marks the end of any such possibility. “The Coronavirus Killed the Revolution,” declared the headline of a recent essay in The Atlantic by Shadi Hamid, who argued that the COVID-19 crisis makes people crave “normalcy” over deep structural change. As a historian of 18th- and 19th-century France, I think claims like these are mistaken.

Updated at 7:22 p.m. ET on April 4, 2020.

As the coronavirus pandemic continues, many people are now overthinking things they never used to think about at all. Can you go outside? What if you’re walking downwind of another person? What if you’re stuck waiting at a crosswalk and someone is there? What if you’re going for a run, and another runner is heading toward you, and the sidewalk is narrow? Suddenly, daily mundanities seem to demand strategy.

Much of this confusion stems from the shifting conversation around the pandemic. Thus far, the official line has been that the new coronavirus, SARS-CoV-2, could be transmitted only through close contact with infected people or contaminated surfaces. But recently, news reports have suggested that the coronavirus can spread through the air. After 60 choir members in Washington State rehearsed together, 45 fell sick, even though no one seemed symptomatic at the time. Now people who were already feeling cooped up are worrying about going outside. Many state guidelines are ambiguous, and medical advice can muddy matters further. When the writer Deborah Copaken came down with COVID-19 symptoms, her doctor chided her for riding her bike through New York City a week earlier. Going outside in the city wasn’t safe, the physician implied, with “viral load everywhere.”

The federal government’s stockpile of medical supplies, gloves, and masks is nearly exhausted, President Donald Trump admitted at a White House briefing on Wednesday. Meanwhile, individual states are scrambling, bidding against one another for the equipment they need.

“The coronavirus pandemic is a damning indictment of this country’s health-care system,” Joseph Kantor, the assistant state health officer for the Louisiana Department of Health, told me. “The richest country in the world is scrounging around for ventilators” and personal protective equipment.

Read: Why America is uniquely unsuited to dealing with the coronavirus

Kantor is one of a dozen health professionals across the country with whom I spoke this week. Taken together, those conversations reveal a federal government that has failed to protect, supply, and prepare the country and its cities. These health-care workers are looking with horror at the chaos in New York City, as evidence of what can happen to a vibrant city in the absence of national strategy and preparedness. As they struggle to avoid a similar crisis, they’re losing faith in the federal government, and resorting to their own improvised solutions.

Updated at 4:40 ET on March 30, 2020.

The new coronavirus has brought American life to a near standstill, closing businesses, canceling large gatherings, and keeping people at home. All of those people must surely be wondering: When will things return to normal?

The answer is simple, if not exactly satisfying: when enough of the population—possibly 60 or 80 percent of people—is resistant to COVID-19 to stifle the disease’s spread from person to person. That is the end goal, although no one knows exactly how long it will take to get there.

There are two realistic paths to achieving this “population-level immunity.” One is the development of a vaccine. The other is for the disease to work its way through the population, surely killing many, but also leaving many others—those who contract the disease and then recover—immune. “They’re just Teflon at that point,” meaning they can’t get infected again and they won’t pass on the disease, explains Andrew Noymer, a public-health professor at UC Irvine. Once enough people reach Teflon status—though we don’t yet know if recovering from the disease confers any immunity at all, let alone lifelong immunity—normalcy will be restored. (It may also turn out to be the case that people who are immune to the disease can still pass it on under certain circumstances.)*

On a third-down play last season, the Washington Redskins quarterback Alex Smith stood in shotgun formation, five yards behind the line of scrimmage. As he called his signals, a Houston Texans cornerback, Kareem Jackson, suddenly sprinted forward from a position four yards behind the defensive line.

The Trump administration has just released the model for the trajectory of the COVID-19 pandemic in America. We can expect a lot of back-and-forth about whether its mortality estimates are too high or low. And its wide range of possible outcomes is certainly confusing: What’s the right number? The answer is both difficult and simple. Here’s the difficult part: There is no right answer. But here’s the simple part: Right answers are not what epidemiological models are for.

Epidemiologists routinely turn to models to predict the progression of an infectious disease. Fighting public suspicion of these models is as old as modern epidemiology, which traces its origins back to John Snow’s famous cholera maps in 1854. Those maps proved, for the first time, that London’s terrible affliction was spreading through crystal-clear fresh water that came out of pumps, not the city’s foul-smelling air. Many people didn’t believe Snow, because they lived in a world without a clear understanding of germ theory and only the most rudimentary microscopes.

At this stage in the COVID-19 pandemic, uncertainty prevails. The greatest error that geopolitical analysts can make may be believing that the crisis will be over in three to four months, as the world’s leaders have been implying. As documented in The Atlantic and elsewhere, public-health experts make a compelling case that COVID-19 could be with us in one way or another until a vaccine comes on the market or herd immunity is achieved—either of which could take 12 to 18 months, unless we get lucky with a cure or an effective treatment before then. A long crisis, which is more likely than not, could stretch the international order to its breaking point. Even after a vaccine is available, life will not go back to normal. COVID-19 was not a black swan and will not be the last pandemic. A nervous world will be permanently changed.