Short answers, pulled from the story.
Wallonia, officially the Walloon Region, is one of the three federal regions of Belgium, covering the southern portion of the country. It accounts for 55 percent of Belgium's territory but only 31 percent of its population. The capital is Namur and the most populous city is Charleroi.
Wallonia was the first fully industrialized area in continental Europe and ranked as the second industrial power in the world in proportion to its population and territory, after only the United Kingdom. Its Sambre and Meuse valley, rich in coal and iron, formed the industrial backbone of Belgium. From the beginning of the 19th century through the middle of the 20th century, Wallonia was the more prosperous half of Belgium.
By the end of the 1950s, Wallonia's factories were antiquated and its coal was running out, with extraction costs rising steadily. Industrial activity shifted north to Flanders, reversing the wealth gap between the two regions. Wallonia now suffers from high unemployment, with rates reaching 30 percent in areas around Charleroi and Liège, and a GDP per capita of 25,700 euros, equal to 85 percent of the EU27 average as of 2018.
Zenobe Gramme invented the Gramme dynamo, the first generator to produce power on a commercial scale. Ernest Solvay developed the Solvay process for producing soda ash and founded the Solvay Conferences in 1911, which deeply influenced quantum physics. Georges Lemaître of the Université catholique de Louvain proposed the Big Bang theory in 1927, and three Walloon scientists won Nobel Prizes in Physiology or Medicine: Jules Bordet in 1919, and Albert Claude and Christian De Duve in 1974.
The main symbol is the coq hardi, or bold rooster, chosen as an emblem on the 20th of April 1913 and designed by Pierre Paulus on the 3rd of July 1913. The flag shows a red rooster on a yellow background. The anthem, Le Chant des Wallons, was written by Theophile Bovy in 1900 and composed by Louis Hillier in 1901. The Walloon Parliament made these symbols official in 1998.
Georges Simenon was a Walloon author described by the Tribune de Genève as likely the most widely read French-speaking writer in the world. More than 500 million of his books have been sold and they have been translated into 55 languages.