Excited, my father starts climbing it. We are in the air-conditioned residence of America's ambassador to Phnom Penh, formerly the British embassy. On a humid day in 1964 - in an incident unreported at the time because Western journalists were banned - my father walked down this staircase to confront about 1,000 angry students who had come to trash the building. They were acting on instructions from Cambodia's ruler, Prince Norodom Sihanouk.
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