That education should instill and nurture democracy is an American truism. Yet organizations such as the Business Roundtable, together with conservative philanthropists such as Bill Gates and Walmart’s owners, the Waltons, have been turning public schools into corporate mills. Their top-down programs, such as Common Core State Standards, track, judge, and homogenize the minds of millions of American students from kindergarten through high school. But corporate funders would not be able...