It's actually a lot more complicated than this. China buys a TONNE of natural resources from Canada(and info on said resources is probably one of the most likely targets). Canada is probably in even more of a bind vis a vis China then the United States is. While Canada's government isn't nearly as indebted to the Chinese as the Americans are, the Canadian economy depends much more on selling to China than the US economy does. Of course on the flip side if you eliminate access to Canadian resources all of a sudden Chinese manufacturing becomes much more uncompetitive.