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
Southern Netherlands until 1867. The King of the Netherlands was Grand Duke of Luxembourg until 1890, when William III was succeeded by his daughter, Wilhelmina of the Netherlands – but Luxembourg still followed the Salic law at the time, which forbade a woman to rule in her own right, so the union of the Dutch and Luxembourger crowns then ended. The northwestern two-thirds of the original Luxembourg remains a province of Belgium. The Spanish Netherlands (Dutch: "Spaanse Nederlanden", Spanish: "Países Bajos españoles") was a portion of the Low Countries controlled by Spain from 1556 to 1714, inherited from the Dukes of Burgundy.