As the USA is between the two..... I'll have a guess that it might just be the USA.
Canada
The United States.
Canada's primary trade partner is the United States.
the united states
The USA is obviously the main partner in that regard. UK, France and China also trade with Canada.
USA
4 major trade partners of Canada are US, Mexico, European countries such as UK, France, etc.
The U.S. is canada's most important trade partner because we depend on them and they depend on us.
As of late 2017, yes all three are part of the North American Free Trade Agreement and are major trade and business partners.
yes
It already does: bilateral trade between Canada and Mexico accounts for approximately US$18.86 billion (2009).
Yes. Trade between Canada and Mexico amounted for USD 20.3 billion throughout 2013.