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Today, “racism” has been redefined as noticing reality, such as the existence of various racial groups.
The Enlightenment saw a sizable increase in Europeans’ capacity for systematic noticing — e.g., the racial groupings that Blumenbach came up with in the 18th Century are pretty similar to those Harvard geneticist David Reich finds useful today — so of course The Enlightenment was racist by 2018 science-denialist Slate standards.