Louisiana
Oklahoma
Oklahoma
Oklahoma shares most of Texas's northern border.
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Texas and Louisiana
The state that makes up most of its northern border is Nebraska.
Oklahoma
Oklahoma
Louisiana
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.
Texas does.
The Republic of Texas extended up into the current state of Wyoming. The Red River and the Arkansas Rivers marked some of the boundaries.
The state that shares a northern border with South Dakota is Nebraska. The capital of Nebraska is Lincoln.