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
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