Why is "History of the European Communities (1973–1993)" trending?

Wikipedia Overview

Between 1973 and 1993 the European Communities saw the first enlargement of the Communities. On 1 January 1973, Denmark, Ireland, and the United Kingdom became the first countries to join the Communities. The détente allowed initiation of the reunification of the continent through establishing the Conference on Security and Co-operation in Europe. Greece was the next to join EC on 1 January 1981, followed by Spain and Portugal joining on 1 January 1986, while Turkey has initiated the procedure in 1987. Upon the fall of the Iron Curtain, the CSCE was transformed in 1990 into Organization for Security and Co-operation in Europe, the Communities enlarged for a fourth time through the German reunification, while other former communist European countries stated their firm commitment to join, prompting formulation of the Copenhagen criteria. This period was, however, also the one which witnessed the first voluntary exit from the Communities, namely the one of Greenland in 1985. The integration progressed under the Delors Commission resulting in the creation of the European Union in 1993.