History of the European Union since 2004 the decision on 31 March 2010 to abolish the Western European Union. In 2007, the fifth enlargement completed with the accession of Romania and Bulgaria on 1 January. 53 MEPs joined the Parliament along with two commissioners, for which two new posts were created in the Commission. The post created for the Romanian Commissioner was Multilingualism, which was criticised by some for its narrow scope. Negotiating process with Croatia as an official candidate country had been stalled for 10 months due to Slovenia's blockade of Croatia's EU accession, which was lifted in September 2009 after an agreement. Croatia has since
European Union law 2011 two new treaties, the European Fiscal Compact and European Stability Mechanism were signed among Eurozone countries. In 2013, Croatia entered the EU. However a further crisis was triggered after the UK's Conservative government chose to hold a referendum in 2016, and campaigners for "leave" (or "Brexit") won 51.89 per cent of votes on a 72.2 per cent turnout. Although the European Union does not have a codified constitution, like every political body it has laws which "constitute" its basic governance structure. The EU's primary constitutional sources are the Treaty on European Union and the Treaty on the Functioning of