When I went to Boundry Waters in the 70s it was pristine. If memory serves, the canoe park was 99% in Canada but one of the lakes had a tiny section in US. This was the only lake with any type of development at all. Houses, boats with motors etc.
None of the lakes in the rest of the park had anything, nothing, nada. We would go days without seeing anyone. You were lucky to find the next portage. You could drink the water from the lakes. Lots of odd regulations about campfires and certain food you could take in, no live bait for fishing etc etc. No motors of any kind.
i hope it's still like that.