Luxembourg

Founded in 963, Luxembourg became a grand duchy in 1815 and a constituent part of the Kingdom of the Netherlands after the Congress of Vienna. When Belgium declared independence from the Netherlands in 1839, Luxembourg lost more than half of its territory to Belgium but gained a larger measure of autonomy within the Kingdom of the Netherlands. Luxembourg gained full independence in 1867 by promising to remain permanently neutral. Overrun by Germany in both world wars, its neutrality ended in 1948 when it entered into the Benelux Customs Union and joined NATO the following year. In 1957, Luxembourg became one of the six founding countries of the EEC (later the EU), and in 1999 it joined the euro currency zone.