Bush and Trump both came to office determined to avoid the mistaken wars of their predecessors. Nevertheless, they both embarked on military adventures fed by a hubristic belief in American power.

But while the U.S. was strong enough — and its adversaries still weak enough — to recoup much of the damage inflicted by Bush’s war, the war unfolding in Iran today will leave behind an America that will have lost much of its global power, standing and influence, destined to confront rising adversaries all on its own.