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
Kingdom of the Netherlands state of the German Confederation. In 1830, Belgium seceded from the Kingdom, a step that was recognised by the Netherlands only in 1839. At that point, Luxembourg became a fully independent country in a personal union with the Netherlands. Luxembourg also lost more than half of its territory to Belgium. To compensate the German Confederation for that loss, the remainder of the Dutch province of Limburg received the same status that Luxembourg had enjoyed before, as a Dutch province that at the same time formed a Duchy of the German Confederation. That status was reversed when the German Confederation ceased