“Disparate impact” is the idea that when normal, rational processes of hiring and promotion don’t yield exactly the right percentages of people from the groups the left favors, the government needs to step in. During the Obama years, the concept was applied to education. The U.S. Department of Education decided that if more black students were being disciplined in school than “ought to be” in terms demographic representation, then schools could face federal action.

At long last, the department, no longer bowing down to leftist ideology, has repealed some of its........

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