It was not until I went to Harvard in 1988 to take a year out from the Foreign Office that I came to realise how riven by ideology the world of US foreign policy had become. For 20 years I had been moulded by the resolute pragmatism of British diplomacy. My American sabbatical threw open the door to intellectual conflict in the study and practice of international relations unlike anything I had experienced. Two great warring clans — the realists and the idealists, those who took the world as they found it and those who saw the world as they would like it to be — were at each other’s throats. At the head of the realists towered Henry Kissinger, as he does to this day, aged 96.
Kissinger remains a figure of profound and sometimes bitter divisiveness. That in itself is astonishing. It is 43 years since he held office.
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