United Kingdom membership of the European Union

The United Kingdom (along with the British Overseas Territory of Gibraltar) 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.

Source: Wikipedia — United Kingdom membership of the European Union (CC BY-SA 4.0)