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
Revolution of 1848 in Luxembourg powers. After being annexed by the French in the Napoleonic Wars, Luxembourg was elevated to a Grand Duchy and awarded to the Dutch King by the Congress of Vienna in 1815. While it was supposed to be ruled by him in personal union, rather than as part of his kingdom, the King-Grand Duke William I treated it merely as a province of the Netherlands. (At the time, modern Belgium was part of the Netherlands, so Luxembourg was not separated from Dutch territory.) The Grand Duchy would also be part of the German Confederation (the successor to the Holy Roman Empire),