I want to know the answer to the following question:
When did Stadtrepublik become a part of Alsace?
All the background I'm provided with is that "Alsace is frequently mentioned with and as part of Lorraine and the former duchy of Lorraine, since it was a vital part of the duchy, and later because German possession as the imperial province (Alsace-Lorraine, 1871–1918) was contested in the 19th and 20th centuries; France and Germany exchanged control of parts of Lorraine (including Alsace) four times in 75 years.". Is that enough to answer the question?