According to the official government website of Industry Canada, in 2012 we produced the following 25 types of machines.
Machines manufactured in Canada
If we divide this by concerns, we will get 6 manufacturers: Toyota (with Lexus), Honda (with Acura), Ford (with Lincoln), Dodge/Chrysler, GM (GMC, Chevrolet and Buick) and Volkswagen (the Germans have a contract with Chrysler to produce their minivan in Canada).
In addition to production, structural and engineering developments play an important role. That is why Japanese cars assembled in Canada are more reliable than American ones. By the way, there is a myth that the repair of American cars is cheaper. In fact, there is little truth in this — first of all, the mass character of the model and the availability of non-original spare parts on sale plays a role. In this regard, the Japanese are in no way inferior to the Americans — they are both massive, and there are a lot of spare parts for them.
And finally, a link to the list of machines manufactured in the USA. As you can see, a very rare Japanese, German or Korean is not produced in the USA. 95-98 percent are locally assembled cars.