The book summarizes a multidimensional study of the benefits and costs of three processes connected with European integration. The time caesura has been determined by three anniversaries: unification of Germany (1990-2014 - the 25th anniversary), creation of the Eurozone (1999-2013; 15 years) and accession of 10 states to the European Union, including Poland (as well as Cyprus, the Czech Republic, Estonia, Latvia, Lithuania, Malta, Slovakia, Slovenia and Hungary; May 2004-April 2014; 10 years). We analyse the genesis, course and effects of these processes. We focus on economic and political aspects determined by the legal timeframe; however, at the same time we do not omit the social aspects of these processes. We perceive them from Poland's perspective, enlarged by a regional dimension. Thus, we examine Poland's role and rank with reference to the above mentioned processes and their impact on Poland.