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.  

european feudalism was a combination of legal and military customs in medieval europe that flourished between the 9th and 15th centuries. broadly defined, it was a way of structuring society around relationships derived from the holding of land in exchange for service or labour.

japanese feudalism. the era of feudalism in japan took place from the 12th through 19th centuries. during that period local rulers, either powerful families or military warlords, dominated the land, while the emperor was merely a figurehead and not a significant political presence.

where's the