Polarization and US foreign policy: key debates and new findings

Polarization in the USA has been on the rise for several decades. In this context, few observers expect politics today to stop “at the water’s edge,” as the old cliché goes. But key questions about the relationship between polarization and US foreign policy remain to be fully answered. To what extent are American ideas about foreign policy now polarized along partisan lines? How is polarization changing the foreign policy behavior of the US Congress and President? And how is polarization altering the effectiveness of US foreign policy and influencing America’s role in the world? In this introductory article to our special issue “Domestic Polarization and US Foreign Policy: Ideas, Institutions, and Policy Implications,” we provide an overview of key debates and existing knowledge about these questions, highlight important new findings from the contributions to the special issue, and suggest avenues for further research on this increasingly important topic.