Answer:
in 1871
Explanation:
Alsace Lorraine consisted of almost 5 thousand square miles of French-German border taken in 1871 when France lost to Prussia in the Franco- Prussian War.
After the territories were lost, France, suffered from the economic activities related to iron, steel, and industries in that region. And the local population prompted a resentment with Germans.
The territories were the main cause of rivalry that boosted the WWI.
When France turned victorious, it took back Alsace Lorraine in 1918-
The lands in that area developed a cultural blend between French and German speaking influences and departments of Bas-Rhin, Haut-Rhin and Moselle formed.
