The Treaty on the European Union or the Maastricht Treaty
The ECSC formed on the 23rd of July, 1952. The EEC was formed in 1957. The EU came into existence in 1993. So it was 41 years after the ECSC.
The Treaty of Brussels.
Maastricht Treaty
The Treaty of the European Union, or the Maastricht Treaty
The Treaty of Maastricht
They are a member of the EU and the Schengen Treaty.
The Lisbon Treaty.
The Maastricht Treaty.
Not with the whole EU but only with some of the EU Member States.
The EU, as it exists now, was formed from the European Economic Community, which was created by the 1957 Treaty of Rome. The EEC came into being on 1 January, 1958. The original members were Belgium, France, Italy, Luxembourg, the Netherlands, and West Germany. So, in one way Germany has 'always' been a member of the EU, and in another it has been a member for 53 years, as it is now 2011.
The Lisbon Treaty.
The former came into being by the Treaty of Rome 1957 and the latter by the Treaty on European Union of 1992 but the Treaty of Lisbon of 2007 (ratified in 2009) amended those two treaties to make the EC (renamed TFEU, Treaty on the Functioning of the EU) as one of the three pillars of the EU.