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North Vietnamese Politburo Member Le Duc Tho (1911 - 1990, left) with US National Security Advisor Henry Kissinger during peace talks on the Vietnam War at Gif-sur-Yvette near Paris, 23rd November 1973. (Photo by AFP/Getty Images)

North Vietnamese Politburo Member Le Duc Tho (1911 - 1990, left) with US National Security Advisor Henry Kissinger during peace talks on the Vietnam War at Gif-sur-Yvette near Paris, 23rd November 1973. (Photo by AFP/Getty Images)