Canada's new leader will end his country's involvement in US-led airstrikes on the Islamic State (IS) group in Iraq and Syria.
The stunning victory of Justin Trudeau is reverberating beyond Canada's borders after the Liberal Party leader emphatically ended a decade of rule by the most conservative leadership in the country's history.
As well as the airstrikes, other areas in which Mr Trudeau differs from his predecessor Stephen Harper are climate change, immigration and whether relations with the US should hinge on the future of the Keystone XL oil pipeline.
Mr Trudeau said he spoke to Barack Obama and told him he would remove Canada's six fighter jets from the bombing campaign in Iraq and Syria.
Speaking at a rally in Ottawa, the Mr Trudeau, 43, the son of Pierre Trudeau, one of Canada's most dynamic politicians, underlined the sea change.
"I want to say this to this country's friends around the world: many of you have worried that Canada has lost its compassionate and constructive voice in the world over the past 10 years. Well, I have a simple message for you on behalf of 35 million Canadians. We're back," he declared.
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