Supremacism is the belief that a certain group of people is superior to all others. The supposed superior people can be defined by age, gender, race, ethnicity, religion, sexual orientation, language, social class, ideology, nationality, culture, or belong to any other part of a particular population.
Sexual
Some feminist theorists have argued that in patriarchy, a standard of male "supremacism" is enforced through a variety of cultural, political, religious, sexual, and interpersonal strategies. Since the 19th century there have been a number of feminist movements opposed to male supremacism, usually aimed at achieving equal legal rights and protections for women in all cultural, political and interpersonal relations.
Racial
Centuries of European colonialism in the Americas, Africa, Australia, Oceania, and Asia were justified by white supremacist attitudes. White European Americans who participated in the slave industry tried to justify their economic exploitation of black people by creating a "scientific" theory of white superiority and black inferiority. Thomas Jefferson, pioneer of scientific racism and enslaver of over 600 black people (regarded as property under the Articles of Confederation), wrote that blacks were "inferior to the whites in the endowments of body and mind." A justification for the conquest and subjugation of Native Americans emanated from their dehumanized perception as "merciless Indian savages", as described in the United States Declaration of Independence.
During the 19th century, "The White Man's Burden", the phrase which refers to the thought that whites have the obligation to make the societies of the other peoples more 'civilized', was widely used to justify imperialist policies as a noble enterprise. Thomas Carlyle, known for his historical account of the French Revolution, The French Revolution: A History, argued that European supremacist policies were justified on the grounds that they provided the greatest benefit to "inferior" native peoples. However, even at the time of its publication in 1849, Carlyle's main work on the subject, the Occasional Discourse on the Negro Question, was poorly received by his contemporaries.
Before the outbreak of the American Civil War, the Confederate States of America was founded with a constitution that contained clauses which restricted the government's ability to limit or interfere with the institution of "negro" slavery. In the Cornerstone Speech, Confederate vice president Alexander Stephens declared that one of the Confederacy's foundational tenets was white supremacy over black slaves. Following the war, a secret society, the Ku Klux Klan, was formed in the South. Its purpose was to maintain white, Protestant supremacy after the Reconstruction period, which it did so through violence and intimidation.
According to William Nichols, religious antisemitism can be distinguished from modern antisemitism which is based on racial or ethnic grounds. "The dividing line was the possibility of effective conversion ... a Jew ceased to be a Jew upon baptism." However, with racial antisemitism, "Now the assimilated Jew was still a Jew, even after baptism ... . From the Enlightenment onward, it is no longer possible to draw clear lines of distinction between religious and racial forms of hostility towards Jews... Once Jews have been emancipated and secular thinking makes its appearance, without leaving behind the old Christian hostility towards Jews, the new term antisemitism becomes almost unavoidable, even before explicitly racist doctrines appear."
One of the first typologies which was used to classify various human races was invented by Georges Vacher de Lapouge (1854–1936), a theoretician of eugenics, who published L'Aryen et son rôle social (1899 – "The Aryan and his social role") in 1899. In his book, he divides humanity into various, hierarchical races, starting with the highest race which is the "Aryan white race, dolichocephalic", and ending with the lowest race which is the "brachycephalic", "mediocre and inert" race, that race is best represented by Southern European, Catholic peasants". Between these, Vacher de Lapouge identified the "Homo europaeus" (Teutonic, Protestant, etc.), the "Homo alpinus" (Auvergnat, Turkish, etc.), and finally the "Homo mediterraneus" (Neapolitan, Andalus, etc.) Jews were brachycephalic just like the Aryans were, according to Lapouge; but he considered them dangerous for this exact reason; they were the only group, he thought, which was threatening to displace the Aryan aristocracy. Vacher de Lapouge became one of the leading inspirations of Nazi antisemitism and Nazi racist ideology.