The United Kingdom was a member state of the European Union (EU) and of its predecessor the European Communities (EC) – principally the European Economic Community (EEC) – from 1 January 1973 until 31 January 2020. Since the foundation of the EEC, the UK had been an important neighbour and then a leading member state, until Brexit ended 47 years of membership. During the UK's time as a member state two referendums were held on the issue of its membership: the first, held on 5 June 1975, resulting in a vote to stay in the EC, and the second, held on 23 June 2016, resulting in a vote to leave the EU.