Cimarron County, OK. It borders Colorado, Kansas, New Mexico, and Texas.
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On the borders of Arizona, New Mexico, Utah and Colorado--"the four corner states".
Two US states have no land borders with other states : Alaska and Hawaii. The state with just one bordering state is Maine (borders New Hampshire).
what borders did the United States gain when it acquired this territory in 1776
There are no countries in the US.
The US states generally are not square. One or more state borders may be straight along a line of longitude or latitude, or they may follow the course of a river or mountain ridge.