Book Chapter Barry Cushman, Federalism, in The Cambridge Companion to the United States Constitution 185 (Karen Orren & John W. Compton eds., 2018) American constitutional federalism emerged from a complex matrix comprised by multiple intellectual, institutional, and experiential sources: from political theorists ranging from Machiavelli to Montesquieu and from Harrington to Hume; from colonial analogies to other dominions connected to the English realm through a common monarch, such as Ireland and seventeenth-century Scotland; and from an assortment of colonial customs, practices, and formal and informal institutional arrangements that were varied, fluctuating, contested, and in many respects underspecified. The multiplicity and diversity ...