The American-Israeli attack on Iran was more than a bad idea; it has turned into a watershed in the decline of the American empire. Some might prefer the word “hegemony” to describe the world order the United States leads, since its flag does not generally fly over the lands it protects or exploits. But the rules are the same: Imperial systems, whatever you call them, last only as long as their means are adequate to their ends. And with the Iran war, President Trump has overextended the empire dangerously.

A Middle Eastern military misadventure is one of the last ways a casual observer would have expected Mr. Trump’s presidency to go wrong. The problems he alluded to in all three of his presidential campaigns had mostly resulted from our leaders’ governing beyond their means. At home, proponents of wokeness underestimated the costs and difficulties of micromanaging interactions between groups. Abroad, the mighty American armed forces proved to have no particular talent for democracy promotion, and there was the recent debacle in Iraq to prove it. Overextension was a danger that President Joe Biden contemptuously dismissed. “We’re the United States of America,” he used to say, “and there’s nothing we can’t do.”

Mr. Trump, people thought, would be different. For all the grandiosity of the expression “Make America great again,” Trump voters did not expect him to take on new problems. The greatness would be mostly atmospheric — braggadocio, not adventurism. The United States could become greater even if it withdrew to a less expansive sphere of influence. When he proclaimed an updated Monroe Doctrine, refocusing American attention on the Western Hemisphere, retrenchment was what most people thought they were getting. In last November’s National Security Strategy, he added, “The days in which the Middle East dominated American foreign policy in both long-term planning and day-to-day execution are thankfully over.”

This was a logical, even an admirable, foreign policy plan. Just as important, history showed it to be workable. Britain had to surrender its far-flung system of colonies and protectorates after World War II. Letting go was often awkward and sometimes left violence in its wake. But except for its ill-fated attempt to join France and Israel in seizing the Suez Canal from Egypt in 1956, Britain did not try to hold territories it could no longer afford. It wound up on reasonably good terms with its former colonial possessions. Its disengagement was a success, though this can be hard to see because what was being managed was decline. Mr. Trump had a chance of pulling off something similar.

The assumption in Washington over the past decade has been that the world is engaged in a game of geostrategic musical chairs and the music is about to stop. China may soon overmatch us not just in military-industrial capacity but also in information technology. The world will harden into a new, less favorable geostrategic configuration. This is the last moment to reshape it in America’s favor. (...)

"We got to move away from negotiations and get back to what we started to do from very beginning ... so weaken this regime that it becomes vulnerable to rising up inside the country. We can't do that, that's something the Iranian people have to do. Can Mossad and the CIA work to help that a little bit? I think so, and I assume they're already doing things."

Fox host: "Well, the intelligence from Mossad has been nothing short of spectacular"