The Splintering of American Public Law
Constitutional tradition has never mattered more for arguing about what the Constitution means. Yet the very idea of a constitutional tradition presents a shape-shifting target. Rather than an entirely distinct body of law, early U.S. constitutional law mixed and blurred with the law of nations in a broader category of “public law” that, unlike other forms of law, sought to govern the sovereign state itself through not only legal institutions but also political structures and actors outside courts.
This Article argues that U.S. constitutional law and international law diverged after the Civil War when courts came to apply them differently against the state as the United States consolidated a continental nation-state. On the one hand, the Supreme Court came to assert authority over constitutional law more aggressively in the context of gutting Reconstruction in the South. On the other, the Court stepped back from international law in deference to Congress as the United States conquered territories and peoples in the West. The simultaneous rise of judicial supremacy as to constitutional law and of judicial deference as to international law recast constitutional law as more legal than political and international law as more political than legal. As their modes of implementation diverged, their shared features became obscured.
By recovering the earlier understanding of public law, this Article challenges how we construct constitutional traditions from a past that did not categorize public law in the precise ways we do today. By integrating the legal histories of western expansion and the gutting of Reconstruction, it shows that regressive policies after the Civil War were enabled not only by judicial supremacy, as new scholarship emphasizes, but also by judicial deference—underscoring that the causes transcended the role of courts. And by showing that the earlier understanding of public law retreated for contingent reasons that obscured, rather than erased, constitutional and international laws’ shared features, the Article ultimately invites readers to reimagine public law in a more integrated way today.