structural:expansion
Ethnicity and ethnic conflicts

Debates over the origins of racism often suffer from a lack of clarity over the term. Many use the term "racism" to refer to more general phenomena, such as xenophobia and ethnocentrism, although scholars attempt to clearly distinguish those phenomena from racism as an ideology or from scientific racism, which has little to do with ordinary xenophobia. Others conflate recent forms of racism with earlier forms of ethnic and national conflict. In most cases, ethno-national conflict seems to owe itself to conflict over land and strategic resources. In some cases, ethnicity and nationalism were harnessed in order to rally combatants in wars between great religious empires (for example, the Muslim Turks and the Catholic Austro-Hungarians).

Notions of race and racism have often played central roles in ethnic conflicts. Throughout history, when an adversary is identified as "other" based on notions of race or ethnicity (in particular when "other" is interpreted to mean "inferior"), the means employed by the self-presumed "superior" party to appropriate territory, human chattel, or material wealth often have been more ruthless, more brutal, and less constrained by moral or ethical considerations. According to historian Daniel Richter, Pontiac's Rebellion saw the emergence on both sides of the conflict of "the novel idea that all Native people were 'Indians,' that all Euro-Americans were 'Whites,' and that all on one side must unite to destroy the other". Basil Davidson states in his documentary, Africa: Different but Equal, that racism, in fact, only just recently surfaced as late as the 19th century, due to the need for a justification for slavery in the Americas.

Historically, racism was a major driving force behind the Transatlantic slave trade. It was also a major force behind racial segregation, especially in the United States in the nineteenth and early twentieth centuries, and South Africa under apartheid; 19th and 20th century racism in the Western world is particularly well documented and constitutes a reference point in studies and discourses about racism. Racism has played a role in genocides such as the Armenian genocide, and the Holocaust, and colonial projects like the European colonization of the Americas, Africa, and Asia. Indigenous peoples have been—and are—often subject to racist attitudes. Practices and ideologies of racism are condemned by the United Nations in the Declaration of Human Rights.