This document is an excerpt from the EUR-Lex website
The creation of the European Coal and Steel Community (ECSC) was the starting point for over 50 years of European treaty-making. Between 1951 (ECSC Treaty) and 2001(Treaty of Nice), no fewer than 16 treaties were signed. This series of treaties did far more than simply amend the original text; new treaties were born and gradually extended the family.
The principal treaties are as follows:
All these treaties were amended on a number of occasions, in particular at the time of accession to membership of new countries in 1973 (Denmark, Ireland and the United Kingdom), in 1981 (Greece), in 1986 (Spain and Portugal), in 1995 (Austria, Finland and Sweden), in 2004 (Czech Republic, Estonia, Cyprus, Latvia, Lithuania, Hungary, Malta, Poland, Slovenia and Slovakia), in 2007 (Bulgaria and Romania) and in 2013 (Croatia).
Following difficulties in some EU countries in ratifying a European constitutional treaty signed in 2004, European leaders in 2007 agreed to convene an inter governmental conference to finalise and adopt not a constitution but a ‘reform treaty’ for the EU. The Lisbon Treaty, signed on 17 December 2007, entered into force on 1 December 2009. It comprises the Treaty on European Union (TEU) and the Treaty on the Functioning of the EU (TFEU). Its provisions are incorporated in the existing treaties.