text: The profitability of the heavy industries to which Wallonia owed its prosperity started declining in the first half of the 20th century, and the centre of industrial activity shifted north to Flanders. The loss of prosperity caused social unrest, and Wallonia sought greater autonomy in order to address its economic problems. In the wake of the 1960-1961 Winter General Strike, the process of state reform in Belgium got underway. This reform started partly with the linguistic laws of 1962–63, which defined the four language areas within the constitution. But the strikes of 1960 which took place in Wallonia more than in Flanders are not principally linked with the four language areas nor with the Communities but with the Regions. In 1968, the conflict between the communities burst out. French speakers in Flanders (who were not necessarily Walloons) were driven out of, most notably the Leuven-based Catholic University amid shouts of "Walen buiten!" ("Walloons out!"). After a formal split of the university in two and the creation of a brand new campus in Wallonia, a wider series of State reforms was passed in Belgium, which resulted in the federalisation of the nation and the creation of the Walloon Region and the French Community (comprising both Wallonia and Brussels), administrative entities each of which would gain various levels of considerable autonomy.
  Geography
  Wallonia is landlocked, with an area of , or 55 percent of the total area of Belgium. The Sambre and Meuse valley, from Liège () to Charleroi () is an entrenched river in a fault line which separates Middle Belgium (elevation ) and High Belgium (). This fault line corresponds to a part of the southern coast of the late London-Brabant Massif. The valley, along with Haine and Vesdre valleys form the sillon industriel, the historical centre of the Belgian coalmining and steelmaking industry, and is also called the Walloon industrial backbone. Due to their long industrial historic record, several segments of the valley have received specific names: Borinage, around Mons, le Centre, around La Louvière, the Pays noir, around Charleroi and the Basse-Sambre, near Namur.