The attitudes of European citizens towards the EU and its institutions before and after their respective countries integration into the Eurozone is an exceptionally important yet entirely understudied topic. Mapping perceptions of Europeans towards the EU from the outside before their accession and from the inside following their integration provides a crucial barometer for Political Scientists to analyse and understand the popularity and levels of satisfaction with the EU amongst the European population at large. In the first book of its kind, Simona Guerra uses data on the popularity of the EU in Central and Eastern before and after accession to explore how and why determinants of support change. In doing so, she also bridges the gap between Eastern and Western analyses on patterns of support for and oppositions towards EU integration. This book is important reading for students and scholars of European integration and the European Union at large.