A nation is a large type of social organization where a collective identity has emerged from a combination of shared features across a given population, such as language, history, ethnicity, culture, territory and/or society. What constitutes a nation can vary widely, as some nations are constructed around ethnicity (see ethnic nationalism) while others are bound by political constitutions (see civic nationalism and multiculturalism). A nation is generally more overtly political than an ethnic group. A nation has also been defined as a cultural-political community that has become conscious of its autonomy, unity and particular interests.
The consensus among scholars is that nations are socially constructed, historically contingent, and organizationally flexible. Throughout history, people have had an attachment to their kin group and traditions, territorial authorities and their homeland, but nationalism – the belief that state and nation should align as a nation state – did not become a prominent ideology until the end of the 18th century. There are three notable perspectives on how nations developed. Primordialism (perennialism), which reflects popular conceptions of nationalism but has largely fallen out of favour among academics, proposes that there have always been nations and that nationalism is a natural phenomenon. Ethnosymbolism explains nationalism as a dynamic, evolving phenomenon and stresses the importance of symbols, myths and traditions in the development of nations and nationalism. Modernization theory, which has superseded primordialism as the dominant explanation of nationalism, adopts a constructivist approach and proposes that nationalism emerged due to processes of modernization, such as industrialization, urbanization, and mass education, which made national consciousness possible.
Proponents of modernization theory describe nations as "imagined communities", a term coined by Benedict Anderson.