Answer:
A nation state is a state in which the great majority shares the same culture and is conscious of it. The nation state is an ideal in which cultural boundaries match up with political ones. According to one definition, a nation state is a sovereign state of which most of its subjects are united also by factors which defined a nation such as language or common descent. It is a more precise concept than country since a country does not need to have a predominant ethnic group.
hope this helped! :)