I want to know the answer to the following question:
Prussia retained most of Alsace-Lorraine up until what event?
All the background I'm provided with is that "The Franco-Prussian War was a conflict between France and Prussia, while Prussia was backed up by the North German Confederation, of which it was a member, and the South German states of Baden, Württemberg and Bavaria.". Is that enough to answer the question?
Answer: no