See below for published commentaries on the United States, along with information about the current author. Interactive data for the United States is available here.
Richard S. Katz (BA Michigan; M.Phil., Ph.D. Yale) is Professor of Political Science at Johns Hopkins. He was co-editor of the European Journal of Political Research (2006-2012), and of the EJPR Political Data Yearbook (1996-2006). His books include A Theory of Parties and Electoral Systems (Johns Hopkins University Press 1980, 2006), Democracy and Elections (Oxford University Press 1997), How Parties Organize: Adaptation and Change in Party Organizations in Western Democracies, ed. with Peter Mair, (Sage 1994), Handbook of Party Politics, ed. with William Crotty (Sage 2006), An Advanced Introduction to Party Politics (Elgar 2023).