Luxembourg an independent state under the personal possession of William I of the Netherlands with a Prussian garrison to guard the city against another invasion from France. In 1839, following the turmoil of the Belgian Revolution, the purely Oil-speaking part of Luxembourg was ceded to Belgium and the Luxembourgish-speaking part (except the Arelerland, the area around Arlon) became what is the present state of Luxembourg. Luxembourg is a founding member of the European Union, OECD, United Nations, NATO, and Benelux. The city of Luxembourg, which is the country's capital and largest city, is the seat of several institutions and agencies of
Fortress of Luxembourg garrison consisted exclusively of Prussian troops: the Netherlands never provided their one-quarter of the garrison. Later, the Luxembourg-Prussian Treaty of 17 November 1856 gave Prussia the exclusive right to garrison troops in Luxembourg. In the 1830, the southern provinces of the United Kingdom of the Netherlands broke off to form the Kingdom of Belgium. At the outbreak of this Belgian Revolution, most Luxembourgers joined the rebels, and from 1830 to 1839 almost all of Luxembourg was administered as part of Belgium. The fortress and city of Luxembourg, held by the Dutch and Prussian troops, was the only part of the