From Lake of the Woods (Manitoba/Minnesota) to Georgia Strait (British Columbia/Washington), the International Boundary between Canada and the US is the 49th parallel of latitude.
Between Lake of the Woods and Georgia Strait, the 49th parallel is the southern boundaries of the Canadian provinces of Manitoba, Saskatchewan, Alberta and British Columbia.
Along that portion of the International Boundary are located the northern boundaries of the US states of Minnesota (part) North Dakota, Montana, Idaho and Washington (part).
5743 miles
49th parallel
montana, 48 degrees
On the border with Canada, between Idaho and the Dakotas. Wyoming is south of it.
The 49th parallel of latitude forms the border between Canada and the US from Lake of the Woods to the Georgia Strait. The 45th parallel of latitude also forms part of the border between Canada and the US along the northern boundaries of the states of New York, Vermont and New Hampshire.
It would so be Montana because the state Montana is bigger.
Idaho
The 49th parallel
Montana has the longer border
No
The southern-most latitude in Canada is 41°N and the majority of the US/Canada border is at 49°N latitude (also called the 49th parallel) from 95°W to 123°W longitude.
45 dagrees north
49 degrees North