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On Canadian Crown Lands, residents can camp for up to 21 days for free but foreign nationals must purchase a permit.
I heard some Walmarts will let people camp overnight in their parking lots. {no guarantees.}
For safe overnight camping use a real campground such as at a lake or national forest. You can get a list of campgrounds, fees and amenities by checking the National Parks web site, most states have them too, in a variety of interesting locations.