The Imperial Territory of Alsace-Lorraine ( or , or ) was a territory created by the German Empire in 1871 after its victory in the Franco-Prussian War. It was made up of almost all of the French region of Alsace and about a quarter of Lorraine, hence its name. France took it back in 1918 and it became part of that country as a result of Treaty of Versailles in 1919. Nazi Germany "de facto" took it back in 1940 but France took it back in 1945.