The European Union: Questions and Answers, Kristin Archick, Specialist in European Affairs. February 21, 2017. Via FAS.

“The European Union: Questions and Answers Congressional Research Service Summary The European Union (EU) is a political and economic partnership that represents a unique form of cooperation among sovereign countries. The EU is the latest stage in a process of integration begun after World War II, initially by six Western European countries, to foster interdependence and make another war in Europe unthinkable. The EU currently consists of 28 member states, including most of the countries of Central and Eastern Europe, and has helped to promote peace, stability, and economic prosperity throughout the European continent. The EU has been built through a series of binding treaties. Over the years, EU member states have sought to harmonize laws and adopt common policies on an increasing number of economic, social, and political issues. EU member states share a customs union; a single market in which capital, goods, services, and people move freely; a common trade policy; and a common agricultural policy. Nine teen EU member states use a common currency (the euro), and 22 member states participate in the Schengen area of free movement in which internal border controls have been eliminated. In addition, the EU has been developing a Common Foreign and Security Policy (CFSP), which includes a Common Security and Defense Policy (CSDP), and pursuing cooperation in the area of Justice and Home Affairs (JHA) to forge common internal security measures. Member states work together through several EU institutions to set policy and to promote their collective interests…”