The prevalence of bipartisanship in U.S. foreign policy: an analysis of important congressional votes

To what extent are U.S. elected officials polarized on foreign policy? And how do patterns of polarization and bipartisanship differ across policy areas? Using an original data set of nearly 3000 important congressional votes since the end of the Cold War, we find that severe polarization remains the exception rather than the norm in U.S. foreign policy debates and that the U.S. Congress is still less polarized on international than on domestic issues. We also show that foreign policy bipartisanship regularly takes several forms, including bipartisan agreement in support of the president’s policies, cross-partisan coalitions, and even bipartisan opposition to the president’s policies. Collectively, our findings provide a more nuanced portrait of the politics of U.S. foreign policy than many recent accounts, point to persistent differences in the political alignments associated with different policy areas, and highlight the importance of conceiving of polarization and bipartisanship as more than binary categories.