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
Reestablishment of the episcopal hierarchy in the Netherlands Gelderland), Groningen (Groningen) and Leeuwarden (Friesland), they would form the northern ecclesiastical province of Utrecht. Roermond and 's-Hertogenbosch became part of the southern ecclesiastical province of the Metropolitan Archbishop of Mechelen (further roughly including present Belgium). After the Dutch Revolt, the northern Netherlands formed the independent Dutch Republic, where Protestant Calvinism was privileged while Catholicism was severely restricted. The first Archbishop of Utrecht, Frederik V Schenck van Toutenburg, was removed from office, thereby ending the short-lived archdiocese. In 1592, Rome declared the province of Utrecht a mission area, the Dutch Mission 'Batavia', soon headed by an apostolic vicar. 's-Hertogenbosch later