These currents began to associate the idea of the nation with the biological concept of a "master race" (often the "Aryan race" or the "Nordic race") issued from the scientific racist discourse. They conflated nationalities with ethnic groups, called "races", in a radical distinction from previous racial discourses that posited the existence of a "race struggle" inside the nation and the state itself. Furthermore, they believed that political boundaries should mirror these alleged racial and ethnic groups, thus justifying ethnic cleansing, in order to achieve "racial purity" and also to achieve ethnic homogeneity in the nation-state.