Portuguese is spoken by nearly everyone in Portugal. The Portuguese ethnic group also comprises 99% of the population. This "marriage" of culture, ethnicity, and political sovereignty makes Portugal a good example of a:

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A nation-state is a political entity characterized by a coinciding of the boundaries of a nation (a group of people with a common culture and identity) and a state (a political entity with sovereignty). Portugal, with its nearly homogeneous ethnic group and widespread use of the Portuguese language, exemplifies this concept.

Portuguese Is Spoken by Nearly Everyone in Portugal