Ethnic groups such as the Basques in Spain are distinct from ethnic groups in the U.S.insofar as the Basques:

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The Basques are largely confined to a particular region of Spain, known as the Basque Country or Euskal Herria. This region spans across parts of Spain and France, but the Basque population is concentrated in Spain, particularly in the provinces of Bizkaia, Gipuzkoa, Araba, and Nafarroa. This concentration of the Basque population contrasts with ethnic groups in the U.S. which are often more dispersed throughout the country.

Ethnic Groups Such as the Basques in Spain Are Distinct