Brussels-Halle-Vilvoorde, has existed since the Belgian Revolution in 1830, when the country was created as a unitary state. At that time, French was the only language in politics, administration, justice, the army and all education except primary, to the disadvantage of Dutch speakers. Some Dutch speakers therefore decided to raise their children in French. Discrimination of the Dutch language started to lessen from the end of the 19th century onwards and came to a complete end in 1967, the year in which the Belgian Constitution got an official Dutch version. Belgium, as a unitary state, consisted of nine provinces with several arrondissements. Each arrondissement also served as an electoral district, however some of them were later grouped together. One of the nine provinces was Brabant, which consisted of the arrondissements of Brussels, Leuven and Nivelles. Upon the fixation of the language border in 1963, the arrondissement of Brussels was split into the bilingual arrondissement of Brussels-Capital and the unilingual Halle-Vilvoorde, but was retained as grouped arrondissements forming the electoral district of Brussels-Halle-Vilvoorde. Furthermore, nothing in the judicial structure was reformed, leaving the judicial arrondissement of Brussels unchanged. In the course of history, the administrative and political situation in Belgium has changed considerably and BHV has grown to become a major exception within the contemporary federal state of Belgium. 1920s–1960s Dynamic system In 1921 Belgium was divided into two monolingual entities (French-speaking Wallonia and Dutch-speaking Flanders). Both languages could be used in Brussels (16 municipalities at that time). A special status was established wherever a large minority used the other language along the linguistic border. The Belgian law of 28 June 1932 on "the use of languages for administrative matters" reinforced the 1921 law and based the language status of every Belgian municipality on the decennial linguistic census. The criterion to belong to the Dutch-speaking or French-speaking language area was the attainment of a threshold of 50%; whereas, over 30% the municipal authorities had to offer services in the minority language as well. A municipality could ask the government to change its linguistic status by a royal decree only after a census would have shown a passage over the 30% or 50% threshold. The 1932 law was implemented only once. As the invasion of Belgium by Germany in 1940 prevented the organization of the decennial census, the next (and last) linguistic census took place in 1947. The results suggested that the