Belgium felt he had collaborated with Germany during the war. The Belgian Congo gained independence in 1960 during the Congo Crisis; Ruanda-Urundi followed with its independence two years later. Belgium joined NATO as a founding member and formed the Benelux group of nations with the Netherlands and Luxembourg. Belgium became one of the six founding members of the European Coal and Steel Community in 1951 and of the European Atomic Energy Community and European Economic Community, established in 1957. The latter has now become the European Union, for which Belgium hosts major administrations and institutions, including the European Commission, the Council
Kingdom of the Netherlands state of the German Confederation. In 1830, Belgium seceded from the Kingdom, a step that was recognised by the Netherlands only in 1839. At that point, Luxembourg became a fully independent country in a personal union with the Netherlands. Luxembourg also lost more than half of its territory to Belgium. To compensate the German Confederation for that loss, the remainder of the Dutch province of Limburg received the same status that Luxembourg had enjoyed before, as a Dutch province that at the same time formed a Duchy of the German Confederation. That status was reversed when the German Confederation ceased