During recent decades, radical right parties have been surging in popularity in many nations, gaining legislative seats, enjoying the legitimacy endowed by ministerial office, and striding the corridors of government power. The popularity of leaders such as Le Pen, Haider, and Fortuyn has aroused widespread popular concern and a burgeoning scholarly literature. Despite the interest, little consensus has emerged about the primary factors driving this phenomenon. The puzzle is to explain why radical right parties have advanced in a diverse array of democracies - including in 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 in Sweden, Britain, and the United States. This book expands our understanding of support for radical right parties through presenting an integrated new theory which is then tested systematically using a wealth of cross-national survey evidence covering almost forty countries.