History of Belgium from Korea in 1955. On September 5, 1944, the Benelux Customs Union was created. It entered into force in 1948, and ceased to exist on 1 November 1960, when it was replaced by the Benelux Economic Union after a treaty signed in The Hague on February 3, 1958. The Benelux Parliament was created in 1955. The Treaty of Brussels, signed on 17 March 1948 by Belgium, the Netherlands, Luxembourg, France, and the United Kingdom, is considered the precursor to the NATO agreement, which Belgium became an official member of on April 4, 1949. The headquarters of NATO are located in
Low Countries the Austrian Netherlands. The United Kingdom of the Netherlands (1815–1830) temporarily united the Low Countries again, before this split into the three modern countries of the Netherlands, Belgium and Luxembourg. During the early months of World War I (around 1914), The Central Powers invaded the Low Countries of Luxembourg and Belgium in what has been come to be known as the German invasion of Belgium. It led to the German occupation of the two countries. However, the German advance into France was quickly halted, causing a military stalemate for most of the war. In the end, a total of approximately