The history of how the federal judiciary shaped American sovereignty has long been hidden, obscured by two often-told stories about the courts and the nation. One tells us that judges historically have ceded authority to the president in foreign affairs, and therefore have had little influence on the United States’ international relations. The other asserts that the Marshall Court’s constitutional rulings laid the foundation for federal sovereignty under the Constitution. Both of these accounts have elements of truth, but only because of developments a century later. The claim that Marshall’s constitutional decisions shaped the nation projects backward into the past an importance those rulings did not have when they were made. And the notion that the courts have historically had little to do with foreign affairs ignores that early judges were central participants in a cooperative effort among the three branches of government to secure the United States’ place in the world. It is that legacy of judicial nation-building, rather than the stories we have inherited, that can help us think about the courts’ role today.