Let us be clear about what happened on February 28. The United States, in concert with Israel, went to war with Iran. It was not the proxy war of attrition that Washington had tolerated for four decades, not the pinprick retaliatory strikes that have been the preferred narcotic of timid administrations, but real war, with the declared intention of breaking the regime’s military power and ending its nuclear ambitions once and for all.One hundred days later, the question is not whether this was worth doing. It manifestly was. The question is whether Washington has the fortitude to see it through.One must consider what has already been achieved, and consider it honestly. Iran’s ballistic missile programme — the crown jewel of its deterrent strategy, the instrument with which it held the entire Middle East hostage — has been largely destroyed. Its navy has been decimated. The nuclear sites at Fordow, Natanz and Isfahan, into which the regime poured decades of effort and tens of billions of dollars, have been reduced to rubble.Whatever the carping of intelligence bureaucrats with agendas and axes to grind, the International Atomic Energy Agency’s own assessment was unambiguous: the damage was enormous. The radical regime spent a generation building towa …