The UK maintained good relations with Western Europe since 1945, and Eastern Europe since end of the Cold War in 1989. After years of dispute with France it joined the European Economic Community in 1973, which eventually evolved into the European Union through the Maastricht Treaty twenty years later. Unlike the majority of European countries, the UK does not use the euro as its currency and is not a member of the Eurozone. During the years of its membership of the European Union, the United Kingdom had often been referred to as a "peculiar" member, due to its occasional dispute in policies with the organisation. The United Kingdom regularly opted out of EU legislation and policies. Through differences in geography, culture and history, national opinion polls have found that of the 28 nationalities in the European Union, British people have historically felt the least European. On 23 June 2016, the United Kingdom voted to leave the European Union and formally left on 31 January 2020.