Mr. Biden will go down in history, fairly or unfairly, as the president who presided over a long-brewing, humiliating final act in the American experiment in Afghanistan. After seven months in which his administration seemed to exude much-needed competence — getting more than 70 percent of the country’s adults vaccinated, engineering surging job growth and making progress toward a bipartisan infrastructure bill — everything about America’s last days in Afghanistan shattered the imagery.

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Even many of Mr. Biden’s allies who believe he made the right decision to finally exit a war that the United States could not win and that was no longer in its national interest concede he made a series of major mistakes in executing the withdrawal. The only question is how politically damaging those will prove to be, or whether Americans who cheered at 2020 campaign rallies when both President Donald J. Trump and Mr. Biden promised to get out of Afghanistan will shrug their shoulders and say that it had to end, even if it ended badly.