Overall, identitarians favor ethnopluralism, which is the idea that nations or ethnicities should not live in the same multicultural societies but rather in geopolitically separate territories (Salzborn 2016, 41; Hentges et al. 2014, 17).
Source: wiktionary
To the degree that there is a theory underlying this radical right nationalism, it is “ethnopluralism.” A term coined by the French New Right intellectual, Alain de Benoist, ethnopluralism stipulates the “equivalency of homogenous peoples in their indigenous territories.”
Source: wiktionary