Economy of Belgium increased unemployment, stemming from the worldwide banking crisis. For 50 years through World War II, French-speaking Wallonia was a technically advanced, industrial region, with its industry concentrated along the sillon industriel, while Dutch-speaking Flanders was predominantly agricultural with some industry, mainly processing agricultural products and textiles. This disparity began to fade during the interwar period. When Belgium emerged from World War II with its industrial infrastructure relatively undamaged thanks to the Galopin doctrine, the stage was set for a period of rapid development, particularly in Flanders. The postwar boom years, enhanced by the establishment of the European Union and NATO
German-speaking Community of Belgium were annexed by Belgium following Germany's defeat in World War I and the subsequent Treaty of Versailles. Thus they also became known as the ', "redeemed cantons". The peace treaty of Versailles demanded the "questioning" of the local population. People who were unwilling to become Belgians and wanted the region to remain a part of Germany were required to register themselves along with their full name and address with the Belgian military administration, headed by Herman Baltia, and many feared reprisals or even expulsion for doing so. In the mid-1920s, there were secret negotiations between Germany and the kingdom of