Show luxemburg grand duchy luxemburg Is a grand duchy its integrity and independence ee were guaranteed by the treaty of london may 11 1867 having been previously since 1815 a part of the germanic confederation A rc referendum feren under universal suffrage taken september 28 1919 to settle somo some of tho the problems incident to the world war resulted in continuing the reign of the grand duchess and declared tor for an economic union with france but france declined the union in favor of belgium A treaty was then negotiated between luxemburg and belgium ellmin eliminating at the customs barrier and providing for th the e use of belgian money in the grand duchy the agreement came in force may 1 1922 and Is tor for 50 years |