1952 Treaty of Rome, to set up the EEC
1967 Brussels Treaty to streamline the European Institutions
1986 Single European Act to prepare for Spain and Portugal's
entry
1993 Maastricht Treaty to prepare for European Monetary
Union
1999 Treaty of Amsterdam to reform European Institutions and
prepare for other countries joining
2003 Treaty of Nice to reform institutions after reaching 25
countries
2009 Treat of Lisbon to make the EU more democratic, more
efficient and better able to address global problems
the EU Treaty