The outlines of Madison’s constitutional architecture are so familiar that even schoolchildren can recite them: not only rule of law and representative government, not just a bill of rights, but also the separation of the national government into three coequal branches, a bicameral Congress, and a concept of federalism that preserved authority in state governments, all of it designed to diffuse power, check factions, balance interests, and prevent tyranny by either the few or the many.

