It's fair to say 2021 was a lot of things: traumatic, stressful, challenging, and — for far too many — heartbreaking. The extended pandemic “has been the perfect storm of stress," says Seth Gillihan, a clinical psychologist, bestselling author, and head of therapy at the self-therapy app Bloom. "It's brought disease, deaths, lockdowns, job losses, and financial stress, plus culture wars and bitter political divisions. The only small consolation might be that we now have better tools than we used to for dealing with it." But these might have been the worst years many of us can remember, history will likely prove them to be far from the worst years ever. Bloom consulted 28 American and British historians for their opinions on the most stressful years in history. The results, starting with the most recent, provide a lot of perspective.