At the heart of the European integration process is the political economy debate over whether the EU should be a market-making project, or if it should combine this with integration in employment and social policy. What has been the impact of the 2004 and 2007 rounds of enlargement upon the political economy of European integration? EU enlargement, the clash of capitalisms and the European social dimension analyses the impact of the 2004 and 2007 enlargements upon the politics of European integration within EU employment and social policy. This book analyses the main policy negotiations in the field and analyses the political positions and contributions of the Central and Eastern European Member States. Through analyses of the negotiations of the Services Directive, the revision of the Working Time Directive and the Europe 2020 poverty target, the book argues that the addition of the Central and Eastern European states has strengthened liberal forces at the EU level and undermined integration with EU employment and social policy.