Question

define nation state
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Answer 1

Answer:

Nation-state, a territorially bounded sovereign polity—i.e., a state—that is ruled in the name of a community of citizens who identify themselves as a nation. ... Members of the core national group see the state as belonging to them and consider the approximate territory of the state to be their homeland.

Answer 2

A Nation State refers to a country with well defined  boundaries which are resided by people with a similar culture, shared history and ethnic character. The people in a Nation State are supposed to have unity, strength and cooperation.