Peronism, the Argentine political movement created by Juan Per-n in the 1940's, has revolved since its inception around a personalistic leader, a set of powerful trade unions, and a weakly institutionalized political party. This book examines why Peronism continued to be weakly institutionalized as a party after Per-n was overthrown in 1955 and argues that this weakness has impeded the consolidation of Argentine democracy. Within an analysis of Peronism from 1943 to 1995, the author pays special attention to the 1962-66 and 1984-88 periods, when some Peronist politicians and union leaders tried, but failed, to strengthen the party structure. By identifying the forces that led to these efforts of party-building and by analyzing the counterforces that thwarted them, he shows how these failures have shaped Argentina's experience with democracy.