There are a few:
Canada
Haiti
Ireland
Denmark
Monaco
Vatican City
San Marino
Qatar
Lesotho
The Gambia
South Korea
Brunei
Timor-Leste
Alaska..
Maine.
Only one other state? Maine. No other states? Alaska and Hawaii.
All states but Alaska and Hawaii border at least one other state. Maine is the only state to border just one state.
Maine.
Maine.
Maine.
America is the only country that borders the state of Kansas.
Juneau
Maine, it shares a border with Vermont.
Maine
That would be the state of Maine.