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 national border between Texas and Mexico
The national border between Montana and Canada

Answer 1

Montana and Canada

Step-by-step explanation:

Its the only option that doesn't have a river in-between the 2 states or Country's

Answer 2

Montana and Canada

Step-by-step explanation:

Arkansas and Mississippi are divided by a river.

Texas and Oklahoma are split by a river.

Texas and Mexico are separated by a river.

Montana and Canada and have no natural boundary.