Economic inequality continues to be one of America’s most hotly debated topics. Still, there has been relatively little discussion of the fact that black-white gaps in joblessness, income, poverty and other measures were shrinking before the pandemic. Why was it happening, and why did this phenomenon go unacknowledged by so much media?

In The Black Boom, Jason L. Riley—acclaimed Wall Street Journal columnist and senior fellow at the Manhattan Institute—digs into the data and concludes that the economic lives of black people improved...