Sounds like you're not very familiar with canada. We have a very narrow populated strip within about 50-100 km of the us border, and then a vast uninhabitable area in the north. Overall population density is a meaningless metric
What about the agricultural land needed to support that many people with Western diet and lifestyle? No matter who moves there, they will adopt those customs in the short to medium term.
The Atlantic coastal regions are pretty moderate and they're also sparsely populated. There's plenty of space in southern Ontario/Quebec, in Edmonton and Calgary...
