The creation of the European Union historically the process of old seventy years. Members of the European Community, in Stuttgard 1980 signed by a solemn declaration on European Union, and only 1 November 1993 entered into force. The integration of national economies in the EU took place in several phases. Beginning with the establishment of a free trade area, customs union, common market, economic union, monetary union, we come to consolidating economic and monetary union. The most important and crucial were the Maastricht criteria from 1992, according to which one can interpret the past, present and future credibility of member states. The criteria are price stability, government finances, exchange rate stability and long-term interest rates. After numerous events and implementation within the scope of the Member States, in 2010 the euro is used as the official currency in 16 countries of the euro area. 1 July 2013. The Republic of Croatia became a full member of the European Union. Croatia's integration into the European family characterized by a variety of ups and downs, with many challenges, which determine the future activities in this field. For Croatia's entry into the Euro area was great, but it can not be a substitute for the necessary reforms. The attention is drawn to the danger of focusing on only the euro unrealistic impression that this all economic problem solving.