I believe Niue is the smallest Self Governing country.
Self-Autonmy
Commonwealth
Puerto Rico is an unincorporated, self-governing territory of the United States and styles itself ( in English) as the Commonwealth of Puerto Rico. Its name in Spanish, Estado Libre Asociado de Puerto Rico, is more literally translated to English as "Free Associated State of Puerto Rico."
Canada joined the Commonwealth after it became self-governing.
A state is a fully self-governing political entity within a country, with its own government and constitution. A territory is an area controlled by a country but does not have the same level of self-governance as a state.
Denmark has two self-governing possessions.
Self-Autonmy
Denmark
Domninion
Yes.
Australia is both the smallest continent and a self-contained country.
Commonwealth
1867
Greenland is a part of Denmark.
Japan is an independent, self-governing nation.
Commonwealth
Russia is a self-governing sovereign nation.