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From 1909 to 1946, the prime minister also served as our Secretary of State for External Affairs. Following the Second World War, Canada emerged as a leading "middle power," assuming the role of peacekeeper and negotiator in international disputes. Prime ministers remained prominent in international affairs, taking part in visits from foreign heads of state, world tours, treaty negotiations, and other activities.
Cuban Prime Minister Fidel Castro and Prime Minister Pierre Trudeau join in a singalong during Trudeau's Latin American Tour, January 1976. Copyright/Source