She said the two nations held “shared esteems” in front of meeting Canadian Prime Minister Justin Trudeau.
Mrs May is likewise anticipated that would raise an exchange question that could debilitate aviation employments in Northern Ireland.
She has beforehand campaigned US president Donald Trump about the column including Canadian firm Bombardier, which utilizes 4,500 individuals in Belfast, and Boeing.
Boeing has griped about affirmed hostile to focused practices in the offer of Bombardier’s CSeries fly – and Bombardier could confront noteworthy money related punishments if the US exchange experts find against it.
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Mrs May’s visit comes in front of an arrangement amongst Canada and the EU, the Comprehensive Economic and Trade Agreement (Ceta), coming into drive on 21 September.
The PM wants to utilize Ceta as the model for a reciprocal exchange bargain for when the UK is avoided from Ceta after Brexit.
Under the EU-Canada understanding, which took seven years to arrange, Canada consented to dispose of 98% of its import obligations.
Mrs May and Mr Trudeau are required to set up another joint working gathering to set up the preparation for a different arrangement.
Under EU participation manages, the UK is precluded from actualizing a remote organized commerce assention until the point that it leaves, so has rather set up working gatherings abroad, incorporating with Japan, the US and Australia.
Talking in front of her visit, Mrs May stated: “When we meet up and function as one to extend our mutual esteems on the world stage, we frame an effective union.
“My visit to Canada today is tied in with perceiving our past as well as looking forward to our splendid future.”
She indicated a “since quite a while ago shared history” between the two nations, including: “We celebrate together our common government, and close ties of family and fellowship.”
The UK-Canada reciprocal exchange relationship is believed to be worth £15.2bn a year, while Britain is the second-greatest goal for Canadian speculation abroad, with £1.75bn put resources into the nation since March.