While a Walloon industrial and mining base developed during the 19th century, the largely agrarian Flanders area trailed in socio-economic development, leading to widespread demands for regional autonomy and the correction of imbalances in taxation, social services, and representation. The deterioration of the Walloon industrial base in the late 20th century occurred parallel to the growth of service and technological industries in Flanders, aggravating socio-economic tensions.