With its victory in the Civil War, the Union affirmed the primacy of the national sovereignty of the United States. After the conflict, the country was absorbed by the consequences of this momentous event. Yet, even in this context, the monetary policies of the government became contentious and led to the eventual redefinition of sovereignty. This article explores how the American institutional structure and political system allowed the money question to become a spatial issue, opposing the great sections of the country. In turn, this sectionalism triggered a confrontation between alternative understandings of what sovereignty entailed in terms of both political legitimacy and spatial scales. By the end of the century, the scope of sovereign power would be redefined, and currency abandoned as one of its instruments.