History of Belgium on matters of religion and, in recent decades, it has faced new divisions over differences of language and unequal economic development. This ongoing antagonism has caused far-reaching reforms since the 1970s, changing the formerly unitary Belgian state into a federal state, and repeated governmental crises. It is now divided into three regions: Flanders (Dutch-speaking) in the north, Wallonia (French-speaking) in the south, and bilingual Brussels in the middle. There is also a German-speaking population along the border with Germany that was granted to Prussia in the Congress of Vienna in 1815 but added to Belgium following the 1919 Treaty of
German-speaking Community of Belgium officially considered part of the German-speaking Community of Belgium: Bleiberg-Welkenraedt-Baelen in northeastern province of Liège and Arelerland (city of Arlon and some of its nearby villages in southeastern province of Belgian Luxembourg). However, in these localities, the German language is declining due to the expansion of French. The area known today as the East Cantons consists of the German-speaking Community and the municipalities of Malmedy and Waimes (), which belong to the French Community of Belgium. The East Cantons were part of the Rhine Province of Prussia in Germany until 1920 (as the counties (') of Eupen and Malmedy), but