== No, the term "state line" is not always the term used. I have traveled fairly extensively and have heard it called a state border as your question suggests, and "the border," and a "the state "boundry." I think there may have been others, which at the moment I can't recall .
The California-Nevada state border.
most likely just another state but especially if it is not called an international border
a state border is the border of state
The imaginary line around a state or country is called a border.
I need help to find out where I can buy State Line Potato Chips
Most likely, "Cool! We're in (insert state name here)!"
Maine IS a border state
None. A border defines the boundary of a state therefore no state will cross the border of another state.
the border state
Alaska
They are not contiguous. Alaska is a part of North America, but has no border with any US State. It does have a maritime border with Russia and a land border with Canada. Hawaii is not in North America, but is a US State located in the Pacific Ocean.
Hawaii is the only state that does not border Tennessee.