evolution took place in Brussels after a performance of Auber's opera La Muette de Portici at the La Monnaie theatre. Brussels became the capital and seat of government of the new nation. South Brabant was renamed simply Brabant, with Brussels as its capital. On 21 July 1831, Leopold I, the first King of the Belgians, ascended the throne, undertaking the destruction of the city walls and the construction of many buildings. Following independence, the city underwent many more changes. The Senne had become a serious health hazard, and from 1867 to 1871 its entire course through the urban area was completely covered over. This allowed urban renewal and the construction of modern buildings and boulevards characteristic of downtown Brussels today..
Throughout this time, Brussels remained mostly a Dutch-speaking city, though until 1921 French was the sole language of administration. However, in 1921, Belgium was formally split into three language regions�Dutch-speaking Flanders, French-speaking Wallonia and bilingual Brussels. During the 20th century the city has hosted various fairs and conferences, including the fifth Solvay Conference in 1927 and two world fairs: the Brussels International Exposition of 1935 and the Expo '58. During World War I, Brussels was an occupied city, but German troops did not incur much damage. In World War II the city was again occupied, and was spared major damage during its occupation by German forces before it was liberated by the British Guards Armoured Division. The Brussels Airport dates to the occupation.
After the war, Brussels was modernized for better and for worse. The construction of the North�South connection linking the main railway stations in the city was completed in 1952, while the first Brussels premetro was finished in 1969, and the first line of the Brussels Metro was opened in 1976. Starting from the early 1960s, Brussels became the de facto capital of what would become the European Union, and many modern
