Luxembourg The First World War scarcely has a presence in the collective memory of Luxembourgers, and the country’s historians have until now shown little interest in the period. Luxembourg’s entry into the Zollverein (German Customs Union, 1842) engendered very close economic links between the Grand Duchy and the neighboring German territories. Luxembourg’s railways passed into German Reich ownership in 1872, and the rise of the iron industry was facilitated by both German capital (e.g. Gelsenkirchener Bergwerk AG) and German workers (more than half the foreigners livi…