Just a few years ago, historian and activist Ibram X. Kendi seemed to be everywhere. At the height of the Black Lives Matter movement, he became one of the leading voices on racism in America—and particularly what he described as antiracism. In 2019, his book How to Be an Antiracist became a bestseller. And later, just months after the death of George Floyd—a Black man killed by a white police officer in Minneapolis—Kendi founded the Center for Antiracist Research at Boston University, receiving $55 million in funding.

But over the last few years,........

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