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"Race" is basically an archaic, outdated and inaccurate cultural construct and taxonomic concept. It resulted from perceived differences due to biological traits, cultural differences and self-identification. For a long time there were attempts to keep it in the scientific domain, but it's clear now that it's really just an archaic classification system that people relied on before modern science (racial classification does not accurately reflect human genetic variation, often quite the opposite) and widespread contact with disparate population groups.