Another term for a country house is a manor house. Years ago, manor houses were built surrounded by a boat and drawbridge and inside the main feature was a great hall.
A derogatory term, country bumpkins
The term for people who move permanently to another country is "immigrants."
The term "abroad" is commonly used to refer to being in or to another country.
The term for leaving one's homeland to live in another country is emigration.
aggression
Patriotism.
Imperalism
Residential rehab.
export hiatus
A Colony.
estate
Enclave: a piece of territory surrounded by another territory of a different state.