When did the United Kingdom (UK) join the EU?

The United Kingdom joined the European Economic Community (EEC), which later became known as the European Union (EU), on January 1, 1973. This event marked a significant shift in UK participation in European politics and economics, allowing for greater collaboration in trade and policy with other member states. The decision to join came after a lengthy application process, reflecting the UK's evolving attitudes towards European integration during that time.

The year 1973 is key in understanding the timeline of European cooperation and the subsequent developments in the EU, including the introduction of the single market and the eventual expansion of the union. This context helps clarify the importance of this date in both British and European history.