The master race was a concept in Nazi ideology.
"=== Social class ===National Socialist politics was based on competition and struggle as its organising principle, and the Nazis believed that "human life consisted of eternal struggle and competition and derived its meaning from struggle and competition
 Natural selection and the struggle for existence were declared by the Nazis to be the most divine laws; peoples and individuals deemed inferior were said to be incapable of surviving without those deemed superior, yet by doing so they imposed a burden on the superior

