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The state that makes up most of its northern border is Nebraska.
Oklahoma
Washington State's northern border with Canada is a straight line from Blaine WA to its eastern border with Idaho. That northern border line is the most northern point.
Oklahoma, Arkansas, and Louisiana
The state that shares a northern border with South Dakota is Nebraska. The capital of Nebraska is Lincoln.
New Mexico''s northern border is shared with Colorado.
Nebraska.
Nebraska
Idaho does
Montana.
Utah
Kansas