History Political aspects Politics and government Race relations Political culture Racism Right-wing extremists Social movements Ku Klux Klan (1915- ) -- History -- 20th century Political culture -- United States -- History -- 20th century Race identity Racism -- United States -- History -- 20th century Right-wing extremists -- United States -- History -- 20th century Social movements -- United States -- History -- 20th century United States -- Politics and government -- 1913-1921 United States -- Race relations -- Political aspects -- History -- 20th century White nationalism White people White supremacy movements