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
William III of the Netherlands In the first two decades of his reign, he dismissed several cabinets and disbanded the States-General several times, installing royal cabinets which ruled as long as there was support in the elected second chamber of parliament. In what became known as the "Luxembourg Coup of 1856", William unilaterally instituted a new, reactionary constitution for Luxembourg, which he ruled personally, separate from the Netherlands crown. In 1867, France offered to buy Luxembourg, leading to the Luxembourg Crisis, which almost precipitated war between Prussia and France. However, the subsequent Second Treaty of London re-established Luxembourg as a fully independent country. During his