The United States fits best for the definition of a nation-state.
A nation-state is a political unit in which the state and kingdom are congruent. It's miles a greater specific idea than "united states", for the reason that a rustic does now not want to have a predominant ethnic group.
Nation-states have their own characteristics, differing from those of the pre-country-wide states. In a beginning, they had a unique attitude toward their territory when compared with dynastic monarchies.
The nation-states typically had a more centralized and uniform public administration than their imperial predecessors: they have been smaller, and the population was less numerous.
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