After world war II, many educated Asians and Africans questioned the nation state concept of European communal identity.
In a nation state, the state and the nation are one political entity. Since a country does not necessarily need to have a dominating ethnic group, it is a more precise definition than "country". A diaspora or refugees who reside outside the nation state may be considered part of a nation in the sense of a shared ethnicity; some nations in this sense do not have a state where that ethnicity is the majority. A nation state is merely a sizable, politically independent country or administrative region in the broadest sense.
