This volume, part of the series Oxford Studies in Comparative Syntax, contains fourteen chapters, in addition to a foreword by the editors. It is devoted to the formal analysis of different aspects of American varieties of Portuguese and Spanish, while presenting their innovations with respect to their European counterparts. The papers collected have been presented at a meeting of the Romania Nova project and represent a wide range of topics in syntax, including null subjects and objects, complex predicates, clitics, and operator-variable constructions, besides one paper on morphology (truncated nominals). They explore these themes according to different theoretical assumptions and methodological tools.