Nevertheless, the immediate cause of the Franco-German War is Prince Leopold's candidacy to the Spanish throne for Prussian Royal House (Hohenzollern-Sigmaringen), which was vacant after Queen Isabella II was deposed in 1868.
The immediate cause of the Franco-German War, was the candidacy of Prince Leopold of Hohenzollern-Sigmaringen (who was related to the Prussian royal house) for the Spanish throne, which had been left vacant when Queen Isabella II had been deposed in 1868.
