On a scale where American’s average 100 with an SD of 15, Canadian’s have a WAIS-IV full-scale IQ of 104.5 with an SD of 13.4.
Interestingly, American whites score almost as high as Canadians. They have a full-scale IQ of 103.4 with an SD of 14.
If we set the U.S. white mean to be 100 with an SD of 15 (the first IQ tests were normed only on whites), then Canadians have a mean of 101 with an SD of 14.4. So Canadians have virtually identical IQs to American whites. It’s unclear what the IQs of Canadian whites are but I suspect they’re identical to Canadians as a whole.