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By Thomas B. Edsall

Mr. Edsall contributes a weekly column from Washington, D.C., on politics, demographics and inequality.

As President Trump continues his march through America’s democratic institutions, trampling constitutional restraints and silencing dissent, one of the most pressing questions is: What damage is beyond repair, and what can still be undone?

On July 19, the British medical journal The Lancet published a study, “Evaluating the Impact of Two Decades of U.S.A.I.D. Interventions and Projecting the Effects of Defunding on Mortality up to 2030.”