History of Belgium from Korea in 1955. On September 5, 1944, the Benelux Customs Union was created. It entered into force in 1948, and ceased to exist on 1 November 1960, when it was replaced by the Benelux Economic Union after a treaty signed in The Hague on February 3, 1958. The Benelux Parliament was created in 1955. The Treaty of Brussels, signed on 17 March 1948 by Belgium, the Netherlands, Luxembourg, France, and the United Kingdom, is considered the precursor to the NATO agreement, which Belgium became an official member of on April 4, 1949. The headquarters of NATO are located in
Provinces of Belgium and Luxembourg, as well as parts of modern Germany and France, comprised a number of rival and independent feudal states of varying sizes. These each had their own identities and governments, though in the early modern period almost all the Belgian states became part of larger entities (the Seventeen Provinces (1549-1581) and the Southern Netherlands (after 1581)). Prominent early states in the area of modern Belgium included the Duchy of Brabant, the County of Flanders, the Prince-Bishopric of Liège and the Duchy of Luxembourg; smaller ones included the County of Hainaut, the Duchy of Limburg and the County of Namur,