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
Monarchy of the Netherlands old republic as "sovereign prince". In 1815, after Napoleon escaped from Elba, William Frederick raised the Netherlands to the status of a kingdom and proclaimed himself King William I. As part of the rearrangement of Europe at the Congress of Vienna, the House of Orange-Nassau was confirmed as rulers of the Kingdom of the Netherlands, enlarged with what are now Belgium and Luxembourg. At the same time, William became hereditary Grand Duke of Luxembourg in exchange for ceding his family's hereditary lands in Germany to Nassau-Weilburg and Prussia. The Grand Duchy of Luxembourg was a part of the Netherlands (until