A is a group of people with a shared identity and culture (a nation) who possess their own territory and state government, or a state-level political system that contains all and only members of one nation.

Nation state

Explanation:

Nation state is the community of people in which citizen tends to share a homogeneous factor in common such as culture, language etc.People have their own state in independent form where they are conscious of it being the mainstream.

Cultural boundaries, ethics, history of such nations tends to match with the political aspect of the state.Example of nation-state are Japan, Iceland , South Korea etc.  

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a: social security and social programs