BERLIN - MARCH 25: French President Jaques Chirac and his wife Bernadette pose with German Chancellor and current President of the European Council Angela Merkel and her husband Joachim Sauer prior to Merkel, European Commission President Jose Manuel Barroso and President of the European Parliament Hans-Gert Poettering signing a European Union common declaration, known as the ?Berlin Declaration,? at the German Historical Museum March 25, 2007 in Berlin, Germany. The leaders signed the declaration, which aims to solidify unity in the midst of squabbles over the European Union?s constitution, on the 50th anniversary of the Treaties of Rome, which in 1957 laid the foundation for the creation of the European Union.