In 1918 Iowa Governor William Harding banned foreign language usage in public spaces, including religious sermons. How did this apply to Catholic mass that was in Latin at the time?

by Pompsy

I've recently learned about Iowa Governor William Harding and his infamous Babel Proclamation on May 14, 1918 that outlawed foreign language usage in public places including religious sermons. This bill was enforced in Iowa by Harding and those who used foreign languages were charged with crimes. In 1918 Roman Catholics still had a Latin based mass. How did this law apply to them?

Bodark43

I am not familiar with Harding's proclamation, but the 1918 date would make it far more likely to be part of the general anti-German activity at the time ( which included changing the names of streets that had German names, stopping schools from teaching German, etc). Is there any indication it was really directed at German-speakers, which would have included ( especially in Iowa and the Midwest) Lutheran services in German?