Supremacism

Ultranationalism, or extreme nationalism, is an extremist form of nationalism in which a country asserts or maintains hegemony, supremacy, or other forms of control over other nations (usually through violent coercion) to pursue its specific interests. Ultranationalist entities have been associated with the engagement of political violence even during peacetime.

Supremacism is the belief that a certain group of people is superior to, and should have authority over, all others. The presumed superior group can be defined by various characteristics, including age, sex, race, ethnicity, religion, sexual orientation, language, social class, ideology, nationality, culture, generation, or any other human attribute.

cognitive bias wherein a person overestimates their own qualities and abilities