Introduction / Eric M. Patashnik andWendy J. Schiller
The rise of tribal politics in historical perspective / James A. Morone
Incremental liberalism or prolonged partisan warfare / Matt Grossman
Legislative stalemate in postwar America, 1947-2018 / Sarah A. Binder
Challenges of measuring party unity in a polarized era : th 115th Congress / Frances E. Lee
Polarization and the changing constitutional system : the case of federalism / Nolan McCarty
She's not my governor : negative partisanship and trust in government in the American states / Kristin Kanthak
Gender attitudes and American public opinion in the Trump era / John Sides, Michael Tesler, and Lynn Vavreck
Curating the news : how social media facilitates selective exposure / Samara Klar and Yotam Shmargad
Charge and retreat : asymmetric patterns of political engagement among liberals and conservatives / Deborah J. Schildkraut, Jeffrey M. Berry, and James M. Glaser
Politics industry theory / Katherine M. Gehl and Michael E. Porter
Spoiler alert : why Americans' desires for a third party are unlikely to come true / Lee Drutman, William A. Galston, and Tod Lindberg
Our "undivided support" : Donald Trump, the Republican Party, and executive-centered partisanship / Nicholas F. Jacobs and Sidney M. Milkis
Conclusion : reflections and paths forward / Eric M. Patashnik and Wendy J. Schiller.