You can go to White Nationalist and Alt Right websites and read what they are. There are even white nationalists Mormon sites. But basically they believe that our nation belongs only to whites and not--to use their words Jews, blacks, asians, mongrels, and so on. Here is a quote from Stephen Spencer a leader of the white nationalists and founder of th Alternative Right. "To be white is to be a striver, a crusader, an explorer and a conqueror. We build, we produce, we go upward. And we recognize a central lie of American race relations. We don’t exploit other groups -- we don’t gain anything from their presence. They need us, and not the other way around. America was, until this past generation, a white country, designed for ourselves and our posterity. It is our creation, it is our inheritance, and it belongs to us." You can see their posters with this quote.