When did germany take alsace-lorraine region from france in the franco-prussian war?

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.