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
Foreign relations of Belgium liberation of Belgium at the end of World War II. In March 1948 Belgium joined with France, Luxembourg, the Netherlands, and Britain in an agreement to establish a joint defense system. This agreement, known as the Treaty of Brussels, was a recognition that individual national responses to the threat of aggression were inadequate and that a united defense effort was necessary for mutual security. In 1948, after expressions of concern by several European states that the Treaty of Brussels was too limited in scope and effectiveness, the prime minister of Canada called for a mutual defense system comprising Western Europe