 The post-World War II human migrations, with the resultant demographic and territorial changes of Poland that drastically reduced the number of ethnic minorities in Poland, also played a major role in the creation of the modern Polish state and nationality.In communist Poland the regime adopted, modified and used for its official ideology and propaganda some of the nationalist concepts developed by Dmowski.As Dmowski's National Democrats strongly believed in a "national" (ethnically homogenous) state, even if this criterion necessitated a reduced territory, their territorial and ethnic ideas were accepted and practically implemented by the Polish communists, acting with Joseph Stalin's permission.