The letter below proves that Washington (state) is not part of United States. It was sent with just four cents of postage (two two-cent stamps) and clearly marked as non-domestic (to U.S.) and without United States.
- Washington is a nation-state.
- The USofA is an alliance or union of 50 nation-states.
- U.S. is the entity that manages the administrative affairs of USofA and the territories.
- Domestic, with respect to U.S., means Puerto Rico, DC, etc.