Henry KIssinger is returning to his intellectual and geostrategic roots. In a Spectator article last week, entitled “How to avoid another world war,” he recounts the origins of World War I, which was a key chapter in his early academic work at Harvard. He repeats a point that he and many others have made over the years — that, had the governments of the warring countries known at the time what the consequences of their decisions would be, they would have decided differently: “Europe’s leaders sleepwalked … into a conflict which none of them would have entered had they foreseen...