As the Trump tax cut was being debated in December, California’s Gov. Jerry Brown called the bill “evil in the extreme” and fumed that it would “divide the hell out of us.” He’s right—but in the end, this change could be good for all the states.
In the years to come, millions of people, thousands of businesses, and tens of billions of dollars of net income will flee high-tax blue states for low-tax red states. This migration has been happening for years. But the Trump tax bill’s cap on the deduction for state and local taxes,...