I AM CONFUSED ON THIS QUESTION!!
Which of the following borders is not defined by a natural boundary?
The state border between Arkansas and Mississippi
The state border between Texas and Oklahoma
The international border between Texas and Mexico
The international border between Montana and Canada
Which of the following borders is not defined by a natural boundary?
The state border between Arkansas and Mississippi
The state border between Texas and Oklahoma
The international border between Texas and Mexico
The international border between Montana and Canada