Traditional accounts of the Eighteenth and Twenty-first Amendments to the U.S. Constitution largely ignore the role of the major political parties. We argue that partisan politics was an integral part of the constitutional politics of this period. The need to manage divisions within both parties’ electoral coalitions during the transition from the third to the fourth-party systems led to the enactment of the Eighteenth Amendment without support from either national party. While most accounts trace prohibition’s demise to widespread noncompliance and the graft it generated, we argue that elite congressional support for prohibition gave way when civil service reforms removed federal prohibition agents as patronage resources. We also argue that by giving states control of designing state conventions, and thereby risking state malapportionment of conventions, Democrats succeeded in overcoming the traditional fissures that divided their southern and northern wings.
