The thesis of this article is that by examining Federal Indian Law one better understands that the American constitutional project includes many instances in which power is claimed by force and justified by necessity. Yet jurists sit in judgment, requiring an accounting even when they condone or license exercises of such power. Moreover, occasionally, judges object in the name of limited government powers, of obligations to recognize separately-constituted polities, and of individual rights to equality and liberty. Although lacking much by way of citation to constitutional text, Federal Indian Law represents an example of this genre of federal lawmaking, with its commitment to constitutionalism by judges schooled in the traditions of Marbur...