History of Luxembourg The bombardments ended with the American Army nearing Lampaden on February 22, 1945. Altogether, of a pre-war population of 293,000, 5,259 Luxembourgers lost their lives during the hostilities. After World War II, Luxembourg abandoned its politics of neutrality, when it became a founding member of the North Atlantic Treaty Organization (NATO) and the United Nations. It is a signatory of the Treaty of Rome, and constituted a monetary union with Belgium (Benelux Customs Union in 1948), and an economic union with Belgium and the Netherlands, the so-called BeNeLux. Between 1945 and 2005, the economic structure of Luxembourg changed significantly. The
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