Federalism has generally been characterized as a system of government that is friendly to liberty. It is not obvious, though, why this should be so. Federalism is a form of government where citizens simultaneously reside in at least two governments, each of which has independent authority to tax and to regulate. By contrast, in a unitary form of government citizens face only one government with independent authority to tax and regulate. At first glance, it would seem a bit strange to claim that liberty is more secure when citizens are members of two governments with independent authority than...