During World War II , two Allied Forces conferences were held in the city . The first , held in 1943 , assembled Franklin Delano Roosevelt , president of the United States of America ; Winston Churchill , Prime Minister of the United Kingdom ; William Lyon Mackenzie King , Prime Minister of Canada and T. V. Soong , Chinese Minister of Foreign Affairs . The second conference was held in 1944 and Churchill and Roosevelt participated . The conferences were held at the Citadel and nearby Château Frontenac
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First Quebec Conference
History of Quebec City