1)They all have ratified the Lisbon Treaty which is the newest treaty that defines EU's common institutions - the European Parliament (legislative power), the European Commission (Executive power), the Court of Justice of the EU (judiciary power), European Central Bank, Council of Ministers and the European Council.
2) They share a single market, ensuring the free flow of capital, goods, services and people. 17 of them share a single currency - the euro. More member countries are expected to join the Eurozone as soon as they fulfill the Maastricht criteria (budget deficit, external debt, inflation and other limits).
2) 25 of them (except the newest 2 members, but that will change) according to Schengen Agreement have abolished border controls in between the member countries.
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There were 25 countries in the European Union in 2006.
No new countries joined the European Union in 2005.
Three countries in the European Union are France, Germany, and Italy.
Most European Union countries are in the west of Europe.
The European Union does not consist of all of European countries, so European Union citizenship does not unite all of Europe. Even in the European Union countries, each country has its own specific citizenship, as opposed to one single European Union citizenship. You are only a European Union citizen if you are a citizen of one of the European Union countries. There is no European Union citizenship by itself.
All European Union countries have democratic governments.
People do not join the European Union. Countries do. It is an organisation of countries, not of people. As a result of countries joining, people are living in countries that are in the European Union and can be called its citizens.
Europe is a continent with over 50 countries. The European Union is an organisation. As of 2013, 28 of the countries in Europe are members of the European Union. Many countries in Europe are not members.
No. The European Union has 28 countries that are members. All of those countries are European countries. See the related question below.
European Monetary Union, with the Euro being used as the currency for 17 of the 27 countries that are part of the European Union.
They are called the European Union. But not all countries that are in the European Union use Euros. And there are some countries who are not in the European Union who use Euros.