Belgium–Luxembourg Economic Union Belgium–Luxembourg Economic Union The Belgium–Luxembourg Economic Union (, , ), abbreviated to BLEU or UEBL, is an economic union between Belgium and Luxembourg, two countries in the Benelux Union. BLEU was created by a treaty, signed on 25 July 1921, despite a referendum against such a proposal, between Belgium and Luxembourg, and came into effect upon ratification by the Luxembourg Chamber of Deputies on 22 December 1922. Under the terms of the treaty, the economic frontier was lifted and the Belgian franc and Luxembourg franc were set at a fixed parity (though revised in 1935 and 1944) establishing a monetary
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