The core puzzle which this book resolves is to explain why radical right parties have advanced in a diverse array of democracies--including Austria, Canada, Norway, France, Italy, New Zealand, Switzerland, Israel, Romania, Russia, and Chile--while failing to make comparable gains in similar societies elsewhere, such as Sweden, Britain, and the United States. This book expands our understanding of support for radical right parties by presenting an integrated new theory which is then tested systematically using a wealth of cross-national survey evidence covering almost forty countries.