The rapid gentrification of many large American cities represents a triumph and an opportunity for Republicans—a triumph because it was mainly Republican ideas (welfare reform, aggressive crime-fighting tactics, pro-growth policies) that set the trend in motion, and an opportunity because the wealthier and (frankly) whiter new residents are more likely to vote for the GOP.
Yet a natural Republican constituency—parents with children—continues to exit cities once their kids reach school age. This is bad for Republicans, to be sure, but it’s also bad for cities, as much capital—human, social, and financial—decamps for the suburbs and beyond.
So why are twenty-something, single city-dwellers turning into thirty- and forty-something, suburban moms and dads? It’s education, stupid: the paucity of high-quality urban public schools.
Some hope that current education-reform efforts—raising standards, holding teachers accountable, and creating more charter schools—could help persuade these parents to keep the faith with big cities. And they might, at the margins. But most of these efforts don’t address the fundamental challenge that urban schools face: the diversity of their student population.
Let me be clear: I don’t mean racial or ethnic diversity, which is a huge plus for everybody—the students, the parents, and society at large. Nor is it exactly socioeconomic diversity. The big challenge is academic diversity: Students are coming into school with vastly different levels of academic preparation. Finding a way to make sure that everyone gets what they need—including...