In the 1990s to 2000s, there was an active movement towards a federalisation of the European Union, with the introduction of symbols and institutions usually reserved for sovereign states, such as citizenship, a common currency (used by 19 out of 28 members), a flag, an anthem and a motto (In Varietate Concordia, "United in Diversity"). An attempt to introduce a European Constitution was made in 2004, but it failed to be ratified; instead, the Treaty of Lisbon was signed in 2007 in order to salvage some of the reforms that had been envisaged in the constitution.