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Huge areas of Canada are at high latitudes and very dark, cold, and inhospitable in the winter. Something like 50% of Canada’s population lives south of the northern extent of the US (i.e. south of Seattle, the Upper Peninsula of Michigan, half of MN, and almost all of MT/ND.
Huge areas of Australia are desert.
The population distribution of Canada and Australia is not an accident. The coasts and more temperate climates are much more hospitable.
There’s a lot of land in North Dakota as well. It’s super flat, boring, and winters are ultra cold and windy as hell. There are very good reasons it has a low population. It’s further south than most of the places in Canada you’re talking about.
EDIT: I’d like to add that “we’re not overpopulated, there’s plenty of land!” isn’t really the whole story, either. Occupying every square mile that can be occupied should not be a goal. Leaving more places in a natural state without human impact is highly desirable, IMO.