Either an exile or a refugee, depending on whether they were ordered to leave or not.
A Refugee
refugees
To defect. Or the process of defecting. Snowfreeze
Someone who leaves a country to live elsewhere in order to achieve their economic desires (as opposed to for non-economic reasons, such as political persecution).
An individual who moves to another country is typically referred to as an expatriate or an expat. This term is often used to describe people who live in a country different from their own for various reasons such as work, study, or lifestyle.
I think it's assassination.
a political is someone who travels an stay in the country for 24 hours
A nationalist is someone who is pushing for political independence for their country.
The word that means someone arriving from another country is "immigrant."
someone who represents his country in another country
A third-generation American can best be described as someone whose grandparents came from another country.
A refugee.
someone who has come into a country illegally from another country