Ethnic nationalism, also known as ethnonationalism, is a form of nationalism wherein the nation and nationality are defined in terms of ethnicity, with emphasis on an ethnocentric approach to various political issues related to national affirmation of a particular ethnic group.
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The central theme of ethnic nationalists is that "nations are defined by a shared heritage, which usually includes a common language, a common faith, and a common ethnic ancestry". Those of other ethnicities may be classified as second-class citizens.
The theorist Anthony D. Smith uses the term "ethnic nationalism" for non-Western concepts of nationalism as opposed to Western views of a nation defined by its geographical territory. Diaspora studies scholars extend this non-geographically bound concept of "nation" among diasporic communities, at times using the term ethnonation or ethnonationalism to describe a conceptual collective of dispersed ethnics.