Are all european countries members of the european union?

The European Union (EU) is an economic and political partnership between 27 European countries. It began after World War II to promote economic cooperation, with the idea that countries that trade with one another become economically interdependent and are more likely to avoid future conflict. The Maastricht Treaty established the European Union on November 1, 1993. The treaty created the European Community, which merged the European Coal and Steel Community, the European Atomic Energy Community, and the European Economic Community. The treaty also established the European Union's goals, which include maintaining peace, protecting human rights, and promoting economic and social progress. As of 2013, all 27 members of the European Union are part of the Eurozone. The Eurozone is an economic and monetary union of 17 EU countries that use the euro as their common currency and sole legal tender. The Eurozone was established by the Maastricht Treaty in 1992 and began operating in 1999. The European Union has had many challenges in recent years, including the European debt crisis, which began in 2009. The debt crisis was caused by a number of factors, including the global financial crisis of 2007-2008 and the resulting recession, high government debt levels, and structural problems in the Eurozone. Despite the challenges, the European Union remains an important economic and political partnership. In 2013, the EU had a GDP of $17.28 trillion, making it the largest economic bloc in the world. The EU is also the world's largest trading bloc, accounting for 23% of global trade.