America once told a story of hope, and not just to Americans. West Germans like Mr. Maas, who grew up on the front line of the Cold War, knew that story by heart, and like many others in the world, believed it.

But nearly three decades later, America’s story is in trouble.

The country that helped defeat fascism in Europe 75 years ago next month, and defended democracy on the continent in the decades that followed, is doing a worse job of protecting its own citizens than many autocracies and democracies.

There is a special irony: Germany and South Korea, both products of enlightened postwar American leadership, have become potent examples of best practices in the coronavirus crisis.

But critics now see America failing not only to lead the world’s response, but letting down its own people as well.

“There is not only no global leadership, there is no national and no federal leadership in the United States,” said Ricardo Hausmann, director of the Growth Lab at Harvard’s Center for International Development. “In some sense this is the failure of leadership of the U.S. in the U.S.”

Of course, some countries in Europe have also been overwhelmed by the virus, with the number of dead from Covid-19 much higher as a percentage of the population in Italy, Spain and France than in the United States. But they were struck sooner and had less time to prepare and react.

The contrast between how the United States and Germany responded to the virus is particularly striking.