Maine. It borders only New Hampshire and Canada.
It also borders with two Canadian provinces, Quebec and New Brunswick. However, as neither of these are US states, then, strictly, they don't count as states.
Maine.
Maine
Perhaps you mean "The only state to border one state", in which the answer is Maine.
Maine is the only state with one other bordering or neighboring state and it borders New Hampshire only.
Maine. It only borders New Hampshire.
Maine-- it borders only New Hampshire.
The answer is Maine
Maine
Maine Maine
Maine borders only one other state.
Maine borders only one other state.
Maine borders only one other state, which is New Hampshire.
Maine is the only state that only borders one other state (New Hampshire).
Maine
Maine borders only New Hampshire.
Maine borders only New Hampshire
Maine
Maine
Maine
Maine is the only state that borders one other state (New Hampshire).
no it only borders one state