What is white primacy, the cause of which killed the Muslim Australian terrorist?

Friday's event, where an Austrian killed 50 members of the Muslim community in Christchurch, New Zealand. He was called a white primacy, as was Donald J. Trump, president of the United States of America.

But what is white primacy?

White Supremeity or white primacy is the racist belief that white people are superior to people of other races and therefore should dominate them. The White Supremeia, writes Periscope, has roots in scientific racism, and often contains the Persian arguments.

The white authority was dominant in the United States before and after the American Civil War, and it continued to remain important even in the later construction period of the country. Black and hispanics mostly suffered from white primacy in this country because of centuries of mandatory slavery.

In Germany we had it promoted by the Nazis who led to concentration camps and gas rooms during the 20th century. They viewed the Arian race as superior to other races, especially to Jews, Slavs, and Gypsies.

The racist theory of the Nazi Party, Alfred Rosenberg, promoted the Nordic theory, which viewed the Nordics as superior race even to others, including other Arians.