In what year did the UK join the EU?

The UK joined the European Economic Community, which later became known as the European Union, in 1973. This decision followed extensive discussions and negotiations that began in the 1960s, as the UK aimed to strengthen its position in international trade and political collaboration in Europe. The accession marked a significant shift in the UK's relationship with Europe, as it integrated more closely with other member states economically and politically. This step led to further developments in UK-EU relations, including treaty negotiations and expansions of EU policies and regulations.

The other years mentioned do not represent the UK's entry into the EU. For instance, 1985 refers to the Schengen Agreement, which addressed border control and freedom of movement among some European countries, but not to Britain's EU membership. The year 2000 doesn't feature any significant milestones regarding UK-EU relations relevant to membership, and 1992 was when the Maastricht Treaty was signed, which officially established the European Union and introduced further integration, rather than the entry of the UK into the union.